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MHT CET Physics question

PhysicsWavesMHT CET

and are two stationary sources of sound, of frequencies 320 Hz and 324 Hz respectively, placed at a good distance from each other. The velocity with which an observer should walk towards the line joining and in order that he may hear no beats, is about (velocity of sound )

Answer: (B)

Solution

Walking towards (away from ) with speed : gives \frac{4v}{644}$ =

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Question ID VK-070025