12_InstSolManual_PDF_Part12

12_InstSolManual_PDF_Part12 - 2 log 1 I 2 I 1 2 Db 5 10 log...

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(c) gives and is negative when 12.42. Set Up: with (a) (b) (c) is negative when 12.43. Set Up: Solve: and 12.44. Set Up: Example 12.9 shows that Solve: (a) so and (b) so 12.45. Set Up: Example 12.10 shows that Solve: and Reflect: A change of in distance gives a change of in intensity. Our analysis assumes that the sound spreads from the source uniformly in all directions. 12.46. Set Up: For a whisper, The area of the tympanic membrane is with Intensity is energy per unit time per unit area. (a) (b) so 12.47. Set Up: Intensity is energy per unit time per unit area. with The area of the eardrum is with Part (b) of Problem 12.42 gave Solve: (a) gives and E 5 IAt 5 1 0.100 W / m 2 2 p 1 4.2 3 10 2 3 m 2 2 1 1 s 2 5 5.5 m J I 5 1 10 11 2 I 0 5 0.100 W / m 2 . 11.0 5 log 1 I I 0 2 b 5 110 dB v 5 0.074 mm / s. r 5 4.2 3 10 2 3 m. A 5 p r 2 , I 0 5 1 3 10 2 12 W / m 2 . b 5 10 log 1 I I 0 2 , v 5 Å 2 K m 5 Å 2 1 5.5 3 10 2 15 J 2 2.0 3 10 2 6 kg 5 7.4 3 10 2 5 m / s 5 0.074 mm / s K 5 1 2 m v 2 E 5 IAt 5 1 1 3 10 2 10 W / m 2 2 p 1 4.2 3 10 2 3 m 2 2 1 1 s 2 5 5.5 3 10 2 15 J r 5 4.2 3 10 2 3 m. A 5 p r 2 , I 5 1 3 10 2 10 W / m 2 . 10 4 10 2 r 2 5 r 1 Å I 1 I 2 5 1 15.0 m 2 Å 1 1.00 3 10 4 5 15.0 cm I 2 I 1 5 1.00 3 10 4 log 1 I 2 I 1 2 5 4.00 Db 5 1 40.0 dB. I 2 I 1 5 r 1 2 r 2 2 b 2 2 b 1 5 1 10 dB 2 log
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Unformatted text preview: 2 log 1 I 2 I 1 2 . Db 5 10 log A 1 2 B 5 2 3.0 dB I 2 / I 1 5 1 2 I 2 I 1 5 10 2 3 5 1 / 1000 log 1 I 2 I 1 2 5 2 3 Db 5 2 30 dB b 2 2 b 1 5 1 10 dB 2 log 1 I 2 I 1 2 . I 2 I 1 5 10 2 2.5 5 3.2 3 10 2 3 . log I 2 I 1 5 2 2.5 70.0 dB 2 95.0 dB 5 2 25.0 dB 5 1 10 dB 2 log I 2 I 1 . b 2 2 b 1 5 1 10 dB 2 log I 2 I 1 . b 5 1 10 dB 2 log I I . I , I . b b 5 10 log 1 1.5 3 10 2 14 W / m 2 1 3 10 2 12 W / m 2 2 5 2 18.2 dB. b 5 10 log 1 6.53 3 10 2 10 W / m 2 1 3 10 2 12 W / m 2 2 5 28.1 dB b 5 10 log 1 1.27 3 10 2 4 W / m 2 1 3 10 2 12 W / m 2 2 5 81.0 dB I 5 10 2 12 W / m 2 . b 5 10 log 1 I I 2 , I , I . b I 5 1 10 2 0.20 21 1 3 10 2 12 W / m 2 2 5 6.31 3 10 2 13 W / m 2 . 2 0.20 5 log 1 I I 2 b 5 2 2.0 dB 12-12 Chapter 12...
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