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Q.

A man standing on a platform hears the sound of frequency 605 Hz coming from a frequency 550 Hz from a train whistle moving towards the platform. If the velocity of sound is 330 m/s, then what is the speed of train?

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a

30 m/s

b

35 m/s

c

40 m/s

d

45 m/s

answer is A.

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Detailed Solution

n'=nv−vov−vs, 605=550330−0330−vs⇒vs= 30 m/s
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