P18_078 - 78(a If the destroyer drifts with the current...

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78. (a) If the destroyer drifts with the current, then it will detect a signal with frequency f 0 given by f 0 = f µ v v u 1 = (1000 Hz)(5470 km / h) 5470 km / h (75 . 0km / h 30 . 0km / h) = 1008 . 29 Hz . Thus, ∆ f = f 0 f =8 . 29 Hz . (b) If the destroyer is stationary with respect to the ocean floor, then it is moving at u 2 =30 . 0km
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