ch19 - Chapter 19 Optical Properties Concept Check 19.1...

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Chapter 19 Optical Properties Concept Check 19.1 Question: Briefly discuss the similarities and differences between photons and phonons. Hint: you may want to consult Section 17.2. Answer: Similarities between photons and phonons are: 1) Both may be described as being wave-like in nature. 2) The energy for both is quantized. Differences between photons and phonons are: 1) Phonons are elastic waves that exist within solid materials. Photons are electromagnetic energy packets that may exist in solid materials, as well as in other media. 2) There is a considerable disparity between the velocities of photons and phonons. The velocity of a photon is the same as the velocity of light in the particular medium; for a phonon, its velocity is that of sound. Concept Check 19.2 Question: Electromagnetic radiation may be treated from the classical or the quantum- mechanical perspectives. Briefly compare these two viewpoints. Answer: From the classical perspective, electromagnetic radiation is wave-like in character, and the possible energies of the radiation are continuous. From the quantum-
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ch19 - Chapter 19 Optical Properties Concept Check 19.1...

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