MHT CET Physics question

PhysicsWavesMHT CET

Two sources A and B are sending notes of frequency 680 Hz. A listener moves from A towards B with a constant velocity . If the speed of sound in air is , what must be the value of so that he hears 10 beats per seconds

Answer: (B)

Solution

He hears from B (approaching) and from A (receding), so the beat frequency is

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Question ID VK-070167