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Quantum Mechanics

The world of Quantum Mechanics is fascinating. As you may note, from
my quotes, I enjoyed; In Search of
Schrödinger's Cat, by John Gribbin. I can pretty well state; by
Quantum Mechanic's own admission... "nothing is real"__ thus Quantum Physics
appears to be Fantasy. The atoms, and particles are probably real, but
quantum theory is only in writing, and mathematics. If I take away
quantum theory, will the Universe go on? If I take out mathematics,
what good is quantum theory? Using some of it's own logic... "if I
don't observe, it is not real"... so if quantum theory is not observed, is
it real?
John Gribbin writes about classical actions of Newton's works. (see quotes
below) He writes about comparing classical physics with quantum, as not being
compatible. Well, I have to say... that classical physics and
mathematics__ first, are not that correct, or exact themselves, such that
they should even be used as comparisons in the first place, but they do have good
parts, that should be retained, and as far as I can tell, many are used in
quantum mechanics... so I don't relate to quantum physics as a separate
branch of physics, but more as some of Nature's physics that has some
seemingly peculiar unknown facets. I have shown that Newton's exactly equal
and opposite reactions are not exactly equal and opposite either. If they
were exactly equal, nothing in the universe would move. John says
"pulled down by gravity", but I have shown that anything being pulled is
actually being pushed, as pressure being brought to bear in a direction
towards the "pulling" origin. And, the forces he mentions are all
just pressure actions. It would seem silly to say we have a tennis
ball force origin, a tennis racket force origin, a pen force origin, and a
desk force origin. Nobody knows if there is really a gravity
force... it might be a space force origin, and my bet, would be on all the
actions as pressure! The quantum is said to be so
un-understandable... What about gravitation? A name was given to
actions of bodies coming together that has never been explained how, or
understandable for over 300 years!
How un-understandable is that? In classical physics we have waves... but no-one has ever seen a wave...
we only see material in motion. We do not see a curve... only the
shape of something we named. How un-understandable is that? I realize it is an impossibility to see
some tiny particles, and even some we can see, change their state by looking at
them. But, even for these tiny orts, if an atom is smashed... it is
accomplished with impact pressure. I am willing to bet that nuclear
particles being emitted from radioactive materials are pushed out with
pressure, and not sucked out by the surrounding atmosphere! Isn't
nuclear fission described as a chain reaction of particles "smashing" into
other particles? What kind of action is smashing? Classical
Physics? If you read
the quotations below concerning quantum mechanics you will see pressure
mentioned quite a bit. But, how-do-you-do; __Pressure__ is Classical Physics. Motion is Classical Physics.
And classical physics are supposedly, not used, in quantum mechanics?
Hum... Heisenberg gave us formulation, that observing micro
particles, using
light... a must... in order to see; screws up or alters the results when
observing. In other
words the results are inaccurate. Why should this seem so peculiar?
If taken to extremes__ there is not one measurement in the Universe that
can be measured exactly! We seem to
only be arguing degree of accuracy! What makes the quantum mechanics think
they are so special? The macro of the Universe is always, and
totally inaccurate! (If
someone imagines, thinks, they can measure something, anything, exactly...
it is fantasy, and if allowed, it allows me the same freedom to imagine or
invent, in my mind, tools of fantasy that could observe the quantum
mechanics... fair is fair!) Perpetual Motion has good logic "why" it
is a Fool's Errand to chase; but I don't want to put the unknown cause of
gravitation, or the unanswered items in quantum mechanics as Fool's
Errands quite yet! (And, as a further note... if the Universe is in
total motion__ is this perpetual motion? Hum?)
So far, I still remain with the concept__ problems or experiments created
using fantasy, cannot be explained with reality, and should not be
expected to succeed. If a tree falls in the forest and no-one is there to
hear__ did it make any noise? If no-one was there, there may not
have been a falling tree, and there may not have been a tree at all, or a
forest! If there is no-one alive that ever saw
dinosaurs, does it mean they were never a reality, or existed? Ralph
Waldo Emerson wrote something like... fact is fact; until in time, it
appears as
fiction.
As far as the thought: "if the velocity and position of every particle
in the Universe were known... then the future positioning could be
predicted"... It would seem that it would also be a requirement to
know what humans are thinking... When and where they might move themselves,
or alter the state of other particles?
Richard Feynman was one of my favorite humans, and scientists. But,
when a scientist says something like "absolutely impossible" in
reference to the quantum mechanics world ...it is liable to
come back to haunt him. I always liked the saying: Anything is
possible__ it is just that__ some things are highly improbable, or
difficult to imagine.
Using probabilities of accuracy of measuring a wood board, expecting it to
fit a slot__ is not that much unlike__ using probabilities of accurate
prediction measurements for quantum mechanical results... Isn't it,
a micro quantum scenario when a person thinks of mating up one exactly
smooth plane surface__ exactly with another exactly smooth surface?
How smooth is smooth? And, isn't it wiggling anyway?
~~~~~~~~
In my research of geometric regular polygons and regular polyhedrons,
I dug into the likes of the Mobius Strip. For those that don't know
of this: a Mobius Strip is a single ribbon, or strip of paper. Down
the full length center of one side a black line can be drawn, and down the
other side a red line can be drawn. Then the ends of the strip are
overlapped, and glued together with one 180 twist. Thus the
result is a ring with a twist... and the respective ends of the red and
black lines, mate with opposite colored lines as with reds to blacks. If you trace along the paper
center line continuously... the path will take you completely along the
black line, and the red line before you return to where you started;
720 degrees hence. Or to say it differently, you must go around twice to get back to where you began.
Similar to what is said of the natural attributes of an electron!
"... electron spin is not like the spin of a child's top because the
electron has to spin twice to get back to where it started." (See
quotations below) In Quantum mechanics physics, this phenomena is
considered, as not an occurrence in nature... but it seemed, and seems
similar... to the actions I just mentioned concerning the Mobius Strip.
When I studied the Mobius Strip I somehow wondered what I would get if I
imagined the strip as a length of flattened tubing or hose, (i.e. hollow
cylinder)__ and then I inflated the hose until it was again round? So,
I experimented with geometry and paper models, making measurements and
calculating... A hose with a 180 degree twist, formed into a
circle, creates a round ring or torus. This torus depicts vividly how
the red and black lines, paths or trajectories progress. They
progress in rotation around the torus body... while they also orbit the
ring of the torus. It shows how it is a requirement to orbit twice
to get back to where you started... all the while following a torus
turning in upon itself from one direction... (turning outward if looking at the
other side.) Like the two sides of a clock... looking from the
outside and the inside... from the inside the clock goes counter clockwise...
Also, while the centerline distance of the torus remains exactly the same
as the original flat strip, the inflated and circled hose, now is a
twisted torus with an outer circumference and an inner smaller
circumference. (Sometimes the inside circumference can be zero.) Half of the surface area expanse has been stretched,
while the other half surface area has been shrunk or compressed, directly
proportionally, equal and opposite. Half the black line expanded and
half shrunk... equally and opposite. The red line did likewise,
traveling the reduced and expanded surfaces areas.
Both lines remain the same length but are longer as traversing the
outside of the torus, and become shorter traversing the inside surface portions.
Going back to the possible atom's resonate wave lengths of orbiting
electrons modeled by Louis de Broglie (see quotation below), I have
harbored bad feelings about an electron orbiting as a resonate sinusoidal
wave in the model as Bohr's atom solar system. A vibrating string,
in resonance, has half waves on a plus side, that are real close to equal
the half waves on the negative opposite side. In the world of
electromagnetism the area under the half waves represents the power available, and when it is available in time. The amplitude
represents the voltage with respect to the zero center crossover
alternating wave. If a sinusoidal wave is put into a circle or
ellipse, the wave halves are distorted; inside smaller, outside larger. I have doubts if it would
still resonate? If the wave
didn't rotate while progressing, the lines as above would not need to go
around twice to get home. The only way to maintain a balance of, ability to do work,
(kinetic energy), in the resonating half waves is to rotate the wave progression.
All humps and troughs remain in physical proportion to each other with
equal balancing of energy (work ability) within each. If a particular torus orbit
shell had more than one electron... they would be orbiting opposing each
other in trajectories similar to a double helix formed into a ring.
Thus the orbits of atoms might be a tori... or an orbit torus shell, within
larger torus shell, within larger... I have not gone into this
notion in that depth yet... but, it seems like it
would align with requirements of: orbit integer progression, speed, orbit
shape, orientation, and particle spin of the electron...? It would
also seem that multiple overlaid torus orbits would have electron property
similarities to Schrodinger's "waves" configuration
of space,
and multiple dimensions of 3D, 6D, 9D, & etc... depending on reference to
whatever...? If you buy
a "Slinky" toy, and paint lines on the sides when it is sitting
as a cylinder in an upright
position__ then flex the Slinky into a torus, with one 180 degree twist, and
fasten it together__ it will give you a wonderful visual observation
of the possible trajectory of an electron in an atom, differing from
anything you read about in books... To, my knowledge, this knowledge
of the atom is still unknown?! Quantum Fantasy can be lots of fun!
The following is a
quotation that seems to fit in here, with these writings, rather than down below
with the quote listings:
""Whole
books have been written about the particle zoo, and many physicists have built
their careers as particle taxonomists. But it seems to me that there
cannot be anything very fundamental about such a profusion of particles, and the
situation is rather like that in spectroscopy before quantum theory, when spectroscopists could measure and catalogue the relationships between lines in
different spectra, but had no idea of the underlying causes of the relationships
they observed. Something more truly fundamental must provide the ground
rules for the creation of the plethora of known particles, a view that Einstein
expressed to his biographer Abraham Pais in the 1950's. "It was apparent
that he felt that the time was not ripe to worry about such things and that
these particles would eventually appear as solutions to the equations of a
unified field theory." Thirty years on, it looks very much as if Einstein was
right, and the sketchy outlines of one possible unified theory which
incorporates the particle zoo will be described in the Epilogue.""
"EPILOGUE... UNFINISHED BUSINESS... The story of the quantum as I have
told it here seems neatly cut and dried, except for the semi-philosophical
question of whether you prefer the Copenhagen interpretation or the many-worlds
version. That is the best way to present the story in a book, but it isn't
the whole truth. The story of the quantum is not yet finished, and
theorists today are grappling with the problems that may lead to a step forward
as fundamental as the step Bohr took when he quantized the atom. Trying to
write about this unfinished business is messy and unsatisfying; the accepted
views of what is important and what can safely be ignored may change completely
by the time the report gets into print. But, to give you a flavor of how
things may be progressing, I include in this epilogue, an account of the
unfinished aspect of the quantum story and some hints about what to watch out
for in the future."
""The
clearest sign that there is still more to quantum theory than meets the eye
comes from the branch of quantum theory that is generally regarded as the jewel
in the crown, the greatest triumph of the theory. This is quantum
electrodynamics, or QED for short, the theory that "explains" the
electromagnetic interaction in quantum terms. QED flowered in the 1940's,
and has proved so successful that it has been used as the model for a theory of
the strong nuclear interaction, a theory that is in turn dubbed quantum
chromodynamics, or QCD, because it involves the interactions of particles called
quarks, which have properties that the theorists distinguish, whimsically, by
labeling them with the names of colors. Yet QED itself suffers from a
major flaw. The theory works, but only as a result of fudging the math to
make it fit our observations of the world."
""The
problems relate to the way in which an electron in quantum theory is not the
naked particle of classical theory, but is surrounded by a cloud of virtual
particles. This cloud of particles must affect the mass of the electron.
It is quite possible to set up the quantum equations corresponding to an
electron + cloud, but whenever those equations are solved mathematically they
give infinitely large "answers." (These
particles may not affect the electron, if mass-less, and only gain direction
mass when changed from an, idle virtual particle or idle photon, into a light
frequency radiation... photon with directional mass... rad)
"Starting from the Schrodinger equation, the cornerstone of quantum cookery, the
correct mathematical treatment of the electron yields infinite mass, infinite
energy, and infinite charge. There is no legal mathematical way to get rid
of the infinities, but it is possible to get rid of them by cheating."
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* * * *
Page
Relevant Quotes
"With
his physics of particles such a success, it is hardly surprising that
when Newton tries to explain the behavior of light he did so in terms of
particles. After all, light rays are observed to travel in
straight lines, and the way light bounces off a mirror is very much like
the way a ball bounces off a hard wall. Newton built the first
reflecting telescope, explained white light as a superposition of all
the colors of the rainbow, and did much more in optics, but always his
theories rested upon the assumption that light consisted of a stream of
tiny particles, called corpuscles." In Search of Schrodinger's
Cat... Quantum Physics and Reality; by John Gribbin.
"The
Dutch Physicist Christiaan Huygens was a contemporary of Newton,
although thirteen years older, having been born in 1629. He
developed the idea that light is not a stream of particles but a
wave..." In Search of Schrodinger's Cat... Quantum Physics and
Reality; by John Gribbin.
"Any
good classical physicist starting out from Boltzmann's equations to
construct a blackbody radiation formula would later have completed
integration. Then, as Einstein was later to show, the adding up of
the pieces of energy would have restored the ultraviolet catastrophe.
It was only because Planck knew the answer that he was looking for that
he was able to stop short of the full, seemingly, classical solution of
the equations. As a result, he was left with pieces of energy that
had to be explained. He interpreted this apparent division of
electromagnetic energy into individual pieces as meaning that the
electrical oscillators inside the atom could only emit or absorb energy
in lumps of a certain size, called quanta. Instead of dividing the
available amount of energy up in an infinite number of ways, it could
only be divided into a finite number of pieces among the resonators, and
the energy of such a piece of radiation (E) must be related to its
frequency (denoted y the Greek letter, ν) according to a new formula, E
= hν ,where h is a new constant, now called Planck's constant. In
Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"...Thomas Brown almost eighty years before. Brown noticed that
when a pollen grain floating in a drop of water is examined using a
microscope it is seen to bounce around in an irregular fashion, moving
in a random pattern that is know called Brownian motion. Einstein
showed that this motion, although random, obeys a definite statistical
law, and that the pattern of behavior is exactly what should be
expected if the pollen grain is being 'kicked' by unseen, submicroscopic
particles that move in accordance with the statistics used by Boltzmann
and Maxwell to describe the way atoms move in a gas or liquid. It looks
so obvious... ... But before Einstein made this point,
respected scientists could still find room for to doubt the reality of
atoms; after his paper appeared, there was no longer room to doubt."
In Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"...One of the papers introduced the special theory of relativity and is
largely outside the scope of the present book; another concerned the
interaction of light with electrons and was later recognized as the
first scientific work dealing with what we now call quantum mechanics__
it was for this work that Einstein received the Nobel Prize in 1921.
The third paper was a deceptively simple explanation of a puzzle that
had baffled scientists since 1827__ an explanation that established , as
far as any theoretical paper ever could, the reality of atoms. In
Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"Einstein refined his ideas on quantum radiation over the years up until
1911, establishing that the quantum structure of light is an inevitable
implication of Planck's equation, and pointing out to an unreceptive
scientific world that the way to a better understanding of light would
involve a fusion of the wave and particle theories that had vied with
each other since the seventeenth century. ... It took until 1923
for the reality of the quantum nature of light to be established beyond
all doubt, and in turn led to a new debate about particles and waves
that helped to transform quantum theory and ushered in the modern
version of the theory, quantum mechanics." In Search of
Schrodinger's Cat... Quantum Physics and Reality; by John Gribbin.
"Bohr
had a particular genius... ...was quite willing to patch together
different ideas to make an imaginary 'model' that worked in at least
rough agreement with the observation of real atoms... ... So he
took the image of an atom as a miniature solar system, with electrons
moving around orbits in accordance with the laws of classical mechanics
and electromagnetism... ... His model turned out to have
been wrong in almost every respect, but it provided a transition to a
genuine quantum theory of the atom, and as such it was invaluable." In
Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"De
Broglie thought of the waves as being associated with particles, and
suggested that a particle such as a photon is in fact guided on its way
by the associated wave to which it is tied. The result was a
thorough mathematical description of the behavior of light, which
incorporated the evidence from both wave and particle experiments."
In Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"In
1906 J. J. Thomson had received the Nobel Prize for proving that
electrons are particles; in 1937 he saw his son awarded the Nobel
Prize for proving that electrons are waves. Both father and son
were correct... In Search of Schrodinger's Cat... Quantum Physics and
Reality; by John Gribbin.
"...but de Broglie realized that the fact that electrons only existed in
'orbits' defined by whole number (integers) also looked in some ways
like a wave property. ""The only phenomena involving integers in
Physics were those of interference and of normal modes of vibration,""
he wrote in his thesis. ""This fact suggested to me the idea that
electrons too could not be regarded simply as corpuscles, but that
periodicity must be assigned to them."" ... This is indeed,
similar to the way electrons 'fit' into atoms n states corresponding to
quantum-energy levels 1,2,3,4, and so on. Instead of a stretched
straight string, imagine one bent into a circle, an 'orbit' around an
atom. A standing vibration wave can run happily around the string,
provided that the length of the circumference is a whole number of
wavelengths." In Search of Schrodinger's Cat... Quantum Physics and
Reality; by John Gribbin.
"One
of the puzzles of atomic spectroscopy that the simple Bohr model of the
atom failed to explain involves the splitting of the spectral lines that
'ought' to be single into closely spaced multiplets. Because each
spectral line is associated with a transition from one energy state to
another, the number of lines in the spectrum reveals how many energy
states there are in the atom__ how many 'steps' there are on the quantum
staircase, and how deep each tread is. From their studies of
spectra, the physicists of the early 1920s came up with several possible
explanations for the multiplet structure. What proved to be the
best explanation came from Wolfgang Pauli, and it involved assigning
four separate quantum numbers to the electron. This was in 1924,
when physicists still thought of the electron as a particle and tried to
explain its quantum properties in terms familiar from the everyday
world. Three of these numbers were already included in the Bohr
model, and were thought of as describing the angular momentum of an
electron (the speed with which it moved round its orbit), the shape of
the orbit, and its orientation. The fourth number had to be
associated with some other property of the electron, a property that
came in only two varieties, to account for the observed splitting of the
spectral lines. ...Pauli's fourth quantum number described the
electron's 'spin,' which could be thought of as pointing either up or
down, giving a nice double-valued quantum number. ...But what is
this thing called spin? ...electron spin is not like the spin of a
child's top because the electron has to spin twice to get back to
where it started." In Search
of Schrodinger's Cat... Quantum Physics and Reality; by John Gribbin.
"The
complete break with classical physics comes with the realization that
not just photons and electrons but all 'particles' and all 'waves' are
in fact a mixture of wave and particle." In Search
of Schrodinger's Cat... Quantum Physics and Reality; by John Gribbin.
"Dirac
was delighted to find that by including time as a number along with all
the rest in his equations he was inevitably led to the 'prediction' that
an atom must suffer a recoil when it emits light, just as it should do
if the light is in the form of a particle carrying its own momentum, and
he went on to develop a quantum-mechanical interpretation of the Compton
effect." In Search
of Schrodinger's Cat... Quantum Physics and Reality; by John Gribbin.
"Schrodinger
thought that he had eliminated quantum jumps from one state to another
by putting waves into quantum theory. He envisaged the
'transitions' of an electron from one energy state to another as
something like the change in the vibration of a violin string from one
note to another (one harmonic to another) and he thought of the wave in
his wave as the matter wave invoked by de Broglie. But as other
researchers sought to find the underlying significance of the equations,
these hopes of restoring classical physics to the center stage
evaporated. Bohr, for example, was baffled by the wave concept.
How could a wave, or a set of interacting waves, make a Geiger counter
click just as if it recorded a single particle? What was actually
'waving' in the atom? And, crucially, how could the nature of the
black body radiation be explained in terms of Schrodinger's waves?
So in 1926 Bohr invited Schrodinger to spend some time in Copenhagen,
where they tackled these problems and came up with solutions that were
not very tasteful to Schrodinger. ...First, the waves
themselves turned out, on close inspection, to be as abstract as Dirac's
q numbers. The mathematics showed that they couldn't be real waves
in space, like ripples in a pond, but represented a complex form of
vibrations in an imaginary mathematical space called configuration
space. Worse that that, each particle (each electron, say) needs
its own three dimensions. One electron on its own can be described
by a wave equation in three-dimensional configuration space; to describe
two electrons requires a six dimensional configuration space;
three electrons require nine dimensions, and so on. As for the
blackbody radiation, even when everything was converted into
wave-mechanical language the need for discrete quanta, and quantum
jumps, remained. ... As Heisenberg put it in his book Physics
and Philosophy, "... The paradoxes of the dualism between wave
picture and particle picture were not solved; they were hidden somehow
in the mathematical scheme." ... Without doubt, the appealing
picture of physical real waves circling around the atomic nuclei that
had led Schrodinger to discover the wave equation that now bears his
name, is wrong. Wave mechanics is no more a guide to the reality
of the atomic world than matrix mechanics, but unlike matrix mechanics,
wave mechanics gives an illusion of something familiar and
comfortable. It is that cozy illusion that has persisted to
the present day and that has disguised the fact that the atomic world is
totally different from the everyday world. Several generations of
students, who have now grown up to be professors themselves, might have
achieved a much deeper understanding of quantum theory if they had been
forced to come to grips with the abstract nature of Dirac's approach,
rather than being able to imagine that what they knew about the behavior
of waves in the everyday world gave a picture of the way atoms behave.
And, that is why it seems to me that although there have been enormous
strides in the application of quantum mechanics, cookbook fashion, to
many interesting problems (remember Dirac's remark about the second-rate
physicists doing first rate work), we are scarcely today, more than
fifty years on , any better placed than the physicists of the late
1920s concerning our fundamental understanding of quantum physics."
In Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"Bohr
gave us a philosophical basis with which to reconcile the dual
particle/wave nature of the quantum world. and Born gave us the
basic rules to follow in preparing our quantum recipes." In Search
of Schrodinger's Cat... Quantum Physics and Reality; by John Gribbin.
"What
Heisenberg showed was that if you tried, in this case to measure
both the position and momentum of an electron you could never quite
succeed, because Δp x Δq must always be bigger than h, Planck's constant
divided by 2¶. The more accurately we know the position of an
object, the less certain we are of its momentum__ where it is going."
In Search of Schrodinger's
Cat... Quantum Physics and Reality; by John Gribbin.
"In
addition, we have to interfere with the atomic process in order to
observe them at all, and said Bohr, that means that it is meaningless to
ask what the atoms are doing when we are not looking at them. All
we can do, as Born explained, is to calculate the probability that a
particular experiment will come up with a particular result." In
Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
"For
what quantum mechanics says is that nothing is real and that we cannot
say anything about what things are doing when we are not looking at
them." In Search of
Schrödinger's Cat... Quantum Physics and Reality; John Gribbin
"Erwin Schrödinger was an Austrian scientist instrumental in the
development, in the mid-1920s, of the equations of a branch of science
now known as Quantum Mechanics. ...quantum mechanics provides the
fundamental underpinnings of all modern science. The equations
describe the behavior of very small objects__ generally speaking, the
size of atoms or smaller.__ and they provide the only
understanding of the world of the very small. ...Without these
equations, physicists would be unable to design working nuclear power
stations (or bombs), build lasers, or explain why the sun stays hot.
Without quantum mechanics, chemistry would still be in the Dark Ages,
and there would be no science of molecular biology__ no understanding of
DNA, no genetic engineering__ at all." In Search of Schrödinger's
Cat... Quantum Physics and Reality; John Gribbin
(John
Gribbin referring to Newton's physics... rad) "If I hit a tennis ball
with my racket, the force with which the racket pushes on the tennis
ball is exactly matched by an equal force pushing back on the racket;
the pen on my desk top, pulled down by gravity, is pushed against with
an exact equal reaction by the desk top itself; the force of the
explosion process that pushes the gases out of the combustion chamber of
a rocket produces an equal and opposite reaction on the rocket itself,
which pushes it in the opposite direction."
In Search of Schrödinger's Cat...
Quantum Physics and Reality; John Gribbin
"According to Newton's laws, the behavior of a particle could be exactly
predicted on the basis of its interactions with other particles and the
forces acting on it. If it were ever possible to know the position
and velocity of every particle in the universe, then it would be
possible to predict with utter precision the future of the universe."
In Search of Schrödinger's
Cat... Quantum Physics and Reality; John Gribbin
"Heisenberg uncertainty principle; principle of
indeterminism: The principle that it is not possible to know with unlimited
accuracy both the position and momentum of a particle. An explanation of the
uncertainty is that in order to locate a particle exactly, an observer must be
able to bounce off it a photon of radiation; this act of location itself alters
the position of the particle in an unpredictable way. To locate the position
accurately, photons of short wavelength would have to be used. The high momenta
of such photons would cause a large effect on the position. On the other hand,
using photons of lower momenta would have less effect on the particle's
position, but would be less accurate because of the long wavelength." A Concise
Dictionary of Physics: Oxford
""The basic
element of quantum theory, says Feynman on page 1 of the volume of
his lectures devoted to quantum mechanics, is the double-slit
experiment. Why? Because this is ''a phenomenon which is
impossible, absolutely impossible, to explain in any classical
way, and which has in it the heart of quantum mechanics. In
reality, it contains the only mystery... the basic peculiarities
of all quantum mechanics. ...There are no analogies that we can
carry over from our everyday experience into the world of the quantum,
and the behavior of the quantum world is not like anything familiar.
Nobody knows how the quantum world behaves the way it does, all we know
is that it does behave the way it does. There are just two straws
to which you can cling. The first is that both "particles"
(electrons) and "waves" (photons) behave in the same way__ the rules of
the game are constant. The second is that , as Feynman has put it,
there is only one mystery. If you can come to terms with the
double-slit experiment then the battle is more than half over, since
"any other situation in quantum mechanics, it turns out, can be
explained by saying 'You remember the case of the experiment with the
two holes? Its the same thing""
In Search of Schrodinger's Cat... Quantum Physics and Reality; by John
Gribbin.
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