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MHT CET Physics question

PhysicsWavesMHT CET

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

Answer: (A)

Solution

The approaching train gives Hz and the receding train gives Hz, so

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Question ID VK-070189