Two train whistles have identical frequencies of 180 hz. when one train is at rest in the station, sounding its whistle, a beat frequency of 3.7 hz is heard from a train moving toward us. find the speed of the train. (take the speed of sound to be 345 m/s.)

7 m/s

Step-by-step explanation:

We are given that

Frequency at stationary =

Beat frequency=3.7 Hz

Apparent frequency=

Speed of sound=v=345 m/s

We have to find the speed of train

Apparent frequency=

Substitute the values then we get

Hence, the speed of train=7 m/s

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