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Q.

A person going away from a factory on his scooter at a speed of 36 km/hr listens to the siren of the factory. If the frequency of siren is 525 Hz and a wind is blowing along the direction of scooter at 36km/hr the frequency, heard by the person is (velocity of sound = 340 m/s)

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a

680 Hz

b

510 Hz

c

640 Hz

d

600 Hz

answer is B.

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Detailed Solution

$n^{,} = [\frac{V + w - V_{0}}{V + w}] n = [\frac{340 + 10 - 10}{340 + 10}] 525 \Rightarrow = [\frac{340}{350}] 525 = 510 Hz$

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A person going away from a factory on his scooter at a speed of 36 km/hr listens to the siren of the factory. If the frequency of siren is 525 Hz and a wind is blowing along the direction of scooter at 36km/hr the frequency, heard by the person is (velocity of sound = 340 m/s)