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Solution


Q.

The engine of a train moving with speed 10 ms-1 towards a platform sounds a whistle at frequency 400 Hz. The frequency heard by a passenger inside the train is: (neglect air speed. Speed of sound in air = 330 ms-1)                [2023]
1 388 Hz  
2 400 Hz  
3 412 Hz  
4 200 Hz  

Ans.

(2)

The relative velocity of a passenger with source of sound (engine) is 0. So there will be no Doppler’s effect. So frequency heard is 400 Hz.