28_InstSolManual_PDF_Part1

28_InstSolManual_PDF_Part1 - PHOTONS ELECTRONS AND ATOMS 28...

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28-1 P HOTONS , E LECTRONS , AND A TOMS 28 Answers to Multiple-Choice Problems 1. A, C 2. B 3. B 4. A 5. C 6. C 7. D 8. D 9. A 10. B 11. D 12. C 13. B 14. C 15. C 16. D Solutions to Problems 28.1. Set Up: relates frequency and wavelength and relates energy and frequency for a photon. Solve: (a) (b) (c) so 28.2. Set Up: For a photon, and Solve: (a) (b) (c) This wavelength is comparable to a typical nuclear diameter. 28.3. Set Up: For a photon, Solve: (a) (b) (c) The number of photons is the total energy in a pulse divided by the energy of one photon: Reflect: The number of photons in each pulse is very large. 28.4. Set Up: In 1.00 s the energy output is 50.0 kJ. The energy of a photon is Solve: (a) (b) The number of photons emitted per second is 50.0 3 10 3 J 6.10 3 10 2 26 J / photon 5 8.20 3 10 29 photons. E 5 hf 5 1 6.63 3 10 2 34 J # s 21 92.0 3 10 6 Hz 2 5 6.10 3 10 2 26 J 5 3.81 3 10 2 7 eV h 5 6.63 3 10 2 34 J # s. E 5 hf . 1.20 3 10 2 2 J 3.05 3 10 2 19 J / photon 5 3.93 3 10 16 photons. E 5 hc l 5 1 6.63 3 10 2 34 J # s
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