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MHT CET Physics question

PhysicsWavesMHT CET

A sonometer wire of length 25 cm vibrates in unison with a tuning fork. When its length is decreased by 1 cm, 6 beats are heard per second. What is the frequency of the tuning fork? [MHT-CET 2020]

Answer: (D)

Solution

: gives so

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Question ID VK-070579