Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 32 - Think and Explain: 21

Answer

a. A photon from the TV transmitter has a greater wavelength. b. A photon from the ultraviolet lamp has the greater energy. c. A photon from the ultraviolet lamp has the greater frequency. d. A photon from the ultraviolet lamp has the greater momentum.

Work Step by Step

a. As seen in Figure 26.3, TV/radio electromagnetic waves have much longer wavelengths than ultraviolet waves. b, c. The speed of electromagnetic waves equals frequency multiplied by wavelength. Ultraviolet has a shorter wavelength and thus a higher frequency f. For photons, E = hf, so uv photons have more energy per photon. d. The momentum of a photon is E/c, so the higher-energy uv photon also has grater momentum. (This formula will be learned in a later physics class.)
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