A man is watching two trains, one leavin...

A man is watching two trains, one leaving and the other coming in with equal speeds of `4 m//s`. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = `320 m//s`) will be equal to

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A person is standing on a railway platform. An engine blowing a whistle of frequency 640 Hz approaches him with a speed of 72 km//hr . The frequency of the note heard by the person is (velocity of sound is 340 m//s )

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TARGET PUBLICATION-Sound-Exercise

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