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Q.

A bat moving at 10ms^–1 towards a well sends a sound signal of 8000Hz towards it. On reflection it hears a sound of frequency f. The value of f in Hz is close to (speed of sound = 320ms^–1)

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a

8258

b

8516

c

8424

d

8000

answer is D.

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Detailed Solution

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$f = f_{0} [\frac{v + v_{0}}{v - v_{s}}] = 8000 [\frac{320 + 10}{320 - 10}] = 8516 Hz$

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