P18_076 - 0 m / s) 2 = 77 . 6 Hz . (b) If the speed of the...

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76. Let the frequencies of sound heard by the person from the left and right forks be f l and f r , respectively. (a) If the speeds of both forks are u ,then f l,r = fv/ ( v ± u )and f beat = | f r f l | = fv µ 1 v u 1 v + u = 2 fuv v 2 u 2 = 2(440 Hz)(30 . 0m / s)(343 m / s) (343 m / s) 2 (30 .
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Unformatted text preview: 0 m / s) 2 = 77 . 6 Hz . (b) If the speed of the listener is u , then f l,r = f ( v u ) /v and f beat = | f l f r | = 2 f u v = 2(440 Hz) 30 . 0 m / s 343 m / s = 77 . 0 Hz ....
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