MHT CET Physics question

PhysicsWavesMHT CET

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the midpoint of the line joining them. Both the whistle B and the listener start moving with speed 30 m/s away from whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?

Answer: (B)

Solution

From A (listener receding at 30 m/s): ; from B (source and listener move

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Question ID VK-070023