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Q.

With what velocity a tuning fork of frequency 512 Hz should move away from a stationary observer, so that the apparent frequency heard by him is 256 Hz. (velocity of sound=340m/s)

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a

256 m/s

b

340 m/s

c

512 m/s

d

300 m/s

answer is D.

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Detailed Solution

$n^{1} = (\frac{V}{V + V_{s}}) n$

$\Rightarrow 256 = (\frac{340}{340 + V_{s}}) 512$

$\Rightarrow V_{S} = 340 m / s$

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With what velocity a tuning fork of frequency 512 Hz should move away from a stationary observer, so that the apparent frequency heard by him is 256 Hz. (velocity of sound=340m/s)