Two trains are moving towards each other at speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz. the frequency of the whistle heard by a passenger in the second train before the train meets is (the speed of sound in air is 340 m/s)

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600 Hz

585 Hz

645 Hz

666 Hz

answer is D.

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Detailed Solution

The frequency of whistle heard by passenger in the train B, is n'=n v+v0v−vs=600 340+15340−20≈666 Hz

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