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MHT CET Physics question

PhysicsWavesMHT CET

A tuning fork of frequency 480 Hz produces 10 beat when sounded with a vibrating sonometer string. What must have been the frequency of string, if slight increase in tension produces fewer beats per second than before?

Answer: (B)

Solution

The string is 470 or 490 Hz; increasing tension raises its frequency, which lowers the beats only if the string is below

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Question ID VK-070343