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Q.

Two trains A and B are moving in the same direction with velocities 30 m / s and 10 m / s respectively. B is behind from A and A blows a horn of frequency 450 Hz. Then the apparent frequency heard by observer on train B is (speed of sound is 330 m/s):

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a

425 Hz

b

300 Hz

c

450 Hz

d

350 Hz

answer is A.

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Detailed Solution

fapp =V+V0V+VSf=330+10330+30450⇒fapp =425Hz

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Two trains A and B are moving in the same direction with velocities 30 m / s and 10 m / s respectively. B is behind from A and A blows a horn of frequency 450 Hz. Then the apparent frequency heard by observer on train B is (speed of sound is 330 m/s):