On Friday, November 12, 2021 at 4:17:27 PM UTC-6,
bodk...@gmail.com wrote:
But you can learn what different textbooks say about a subject. I just browsed
through five more textbooks (choosing the ones with the most editions), and
this is what I found:
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From “College Physics” 9th edition, by Hugh D. Young
Page 772
The picture
of light as an electromagnetic wave isn’t the whole story, however. Several
effects associated with the emission and absorption of light reveal that it also has
a particle aspect, in that the energy carried by light waves is packaged in discrete
bundles called photons or quanta. These apparently contradictory wave and particle
properties have been reconciled since 1930 with the development of quantum
electrodynamics, a comprehensive theory that includes both wave and particle
properties. The propagation of light is best described by a wave model, but
understanding emission and absorption by atoms and nuclei requires a particle
approach.
Page 932
What is light? The work of Maxwell, Hertz, and others established
firmly that light is an electromagnetic wave. Interference, diffraction,
and polarization phenomena show convincingly the wave
nature of light and other electromagnetic radiation.
But there are also many phenomena, particularly those involving the emission
and absorption of electromagnetic radiation, that show a completely different
aspect of the nature of light, in which it seems to behave as a stream of particles. In
such phenomena, the energy of light is emitted and absorbed in packages with a
definite size, called photons or quanta. The energy of a single photon is proportional
to the frequency of the radiation, and we say that the energy is quantized.
From “College Physics” 9th Edition, by Raymond A. Serway & Chris Vuille
Page 762
In 1905, Einstein published a paper that formulated the theory of light quanta
(“particles”) and explained the photoelectric effect. He reached the conclusion
that light was composed of corpuscles, or discontinuous quanta of energy. These
corpuscles or quanta are now called photons to emphasize their particle-like nature.
According to Einstein’s theory, the energy of a photon is proportional to the frequency
of the electromagnetic wave associated with it,
same page:
So in the final analysis, is light a wave or a particle? The answer is neither and
both: light has a number of physical properties, some associated with waves and
others with particles.
From “Fundamentals of Physics” 10th Edition, by Jearl Walker:
Page 1154
In 1905, Einstein proposed that electromagnetic radiation (or simply light) is
quantized and exists in elementary amounts (quanta) that we now call photons.
This proposal should seem strange to you because we have just spent several
chapters discussing the classical idea that light is a sinusoidal wave, with a
wavelength x, a frequency f, and a speed c such that f=c/x.
Furthermore, in Chapter 33 we discussed the classical light wave as being an
interdependent combination of electric and magnetic fields, each oscillating at
frequency f. How can this wave of oscillating fields consist of an elementary
amount of something—the light quantum? What is a photon?
The concept of a light quantum, or a photon, turns out to be far more subtle
and mysterious than Einstein imagined. Indeed, it is still very poorly understood.
In this book, we shall discuss only some of the basic aspects of the photon
concept, somewhat along the lines of Einstein’s proposal
From “Physics for Scientists and Engineers – With Modern Physics” - 6th edition, by Paul M Fishbane; Stephen Gasiorowicz; Stephen T Thornton
Page 1079
The propagation of light is governed by its wave properties, whereas the exchange
of energy between light and matter is governed by its particle properties.
This wave–particle duality is a general property of nature. For example, the propagation
of electrons (and other so-called particles) is also governed by wave properties,
whereas the exchange of energy between the electrons and other particles is
governed by particle properties.
From “Physics for Scientists and Engineers – With Modern Physics” - 6th edition, by Paul A. Tipler & Gene Mosca. (This textbook has a whole section on “Wave-Particle duality.”)
Page 1187:
We have seen that light, which we ordinarily think of as a wave, exhibits particle properties when it interacts with matter, as in the photoelectric effect or in Compton scattering. Electrons, which we usually think of as particles, exhibit the wave properties of interference and diffraction when they pass near the edges of obstacles. All carriers of momentum and energy (for example, electrons, atoms, or photons) exhibit both wave and particle characteristics. It might be tempting to say that an electron, for example, is both a wave and a particle, but what does this mean? In classical physics, the concepts of waves and particles are mutually exclusive. A classical particle behaves like a piece of shot; it can be localized and scattered, it exchanges energy suddenly at a point in space, and it obeys the laws of conservation of energy and momentum in collisions. It does not exhibit interference or diffraction. A classical wave, on the other hand, behaves like a sound or light wave; it exhibits diffraction and interference, and its energy is spread out continuously in space and time. A classical wave and a classical particle are mutually exclusive. Nothing can be both a classical particle and a classical wave at the same time.
After Thomas Young observed the two-slit interference pattern by using light in 1801, light was thought to be a classical wave. On the other hand, the electrons discovered by J. J. Thomson were thought to be classical particles. We now know that these classical concepts of waves and particles do not adequately describe the complete behavior of any phenomenon.
Everything propagates like a wave and exchanges energy like a particle.
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Best quotes: "The concept of a light quantum, or a photon, turns out to be far more subtle and mysterious than Einstein imagined. Indeed, it is still very poorly understood.
and
"We now know that these classical concepts of waves and particles do not adequately describe the complete behavior of any phenomenon."
Oscillating photons appear to adequately describe how photons
can seem to be both particles and waves. The only question is:
Why do authors of physics textbooks refuse to view things that way?
It appears they are waiting for someone to make a declaration that
almost everyone else immediately accepts as the correct solution
to the "problem" of particle-wave duality.
No one wants to write a textbook that is immediately attacked and
thrown in the trash by people who are content and INSIST on leaving
the issue as "poorly understood."
Ed