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MHT CET Physics question

PhysicsWavesMHT CET

The lengths of two organ pipes open at both ends are L and (L + d). If they are sounded together, then the beat frequency will be (Neglect end correction) [V = velocity of sound in air, d is the internal diameter of the pipe] [MHT-CET 2019]

Answer: (D)

Solution

Beat frequency ; (a) is the inverted expression,

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Question ID VK-070629