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MHT CET Physics question

PhysicsWavesMHT CET

Two sound waves of frequency 450 Hz and 454 Hz produces beats. The intensity at a point at t = 0 is maximum. After how much time an minimum intensity will be produced at same point:

Answer: (D)

Solution

Beat frequency is 4 Hz so the beat period is , and intensity falls from maximum to minimum in half of it, i.e.

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Question ID VK-070011