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MHT CET Physics question

PhysicsWavesMHT CET

Wire having tension 225 N produces six beats per second when it is tuned with a fork. When tension changes to 256 N, it is tuned with the same fork, the number of beats remain unchanged. The frequency of the fork will be [MHTCET 2016]

Answer: (A)

Solution

so ; equal beats with the fork (frequency ) means , so ,

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Question ID VK-070386