12_InstSolManual_PDF_Part1

12_InstSolManual_PDF_Part1 - MECHANICAL WAVES AND SOUND 12...

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Unformatted text preview: MECHANICAL WAVES AND SOUND 12 8. D 9. A 10. B 11. D 12. A 13. C 14. A 15. C Answers to Multiple-Choice Problems 1. A 2. B 3. A 4. A 5. B 6. C 7. B, C Solutions to Problems 12.1. Set Up: v 5 fl Solve: (a) v 5 344 m / s. For f 5 20,000 Hz, l 5 l5 The range of wavelengths is 1.7 cm to 17 m. (b) v 5 c 5 3.00 3 108 m / s. For l 5 700 nm, f5 For l 5 400 nm, f5 3.00 3 108 m / s c 5 5 7.5 3 1014 Hz. l 400 3 1029 m 3.00 3 108 m / s c 5 5 4.3 3 1014 Hz. l 700 3 1029 m 344 m / s v 5 5 1.7 cm. For f 5 20 Hz, f 20,000 Hz 344 m / s v 5 5 17 m. f 20 Hz The range of frequencies for visible light is 4.3 3 1014 Hz to 7.5 3 1014 Hz. 344 m / s v (c) v 5 344 m / s. l 5 5 5 1.5 cm f 23 3 103 Hz 1480 m / s v (d) v 5 1480 m / s. l 5 5 5 6.4 cm f 23 3 103 Hz Reflect: For a given v, larger f corresponds to smaller l. For the same f, l increases when v increases. 3.00 3 108 m / s c 5 2.87 m 5 f 104.5 3 106 Hz 3.00 3 108 m / s c (b) f 5 5 5 3.0 3 1018 Hz l 0.10 3 1029 m 3.00 3 108 m / s c (c) f 5 5 5 2.7 3 1011 Hz l 1.1 3 1023 m 3.00 3 108 m / s c (d) l 5 5 5 30 nm f 1016 Hz Solve: (a) l 5 12.2. Set Up: v 5 c 5 3.00 3 108 m / s. v 5 fl 12-1 ...
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

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