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MHT CET Physics question

PhysicsWavesMHT CET

When 2 tuning forks (fork 1 and fork 2) are sounded simultaneously, 4 beats are heard. Now, some tape is attached on the prong of fork 2. When the tuning forks are sounded again, 6 beats are heard if the frequency of fork 1 is 200 Hz, then what was the original frequency of fork 2?

Answer: (A)

Solution

Fork 2 was 196 or 204 Hz; loading with tape lowers its frequency, so beats rise from 4 to 6 only if it started at 196 Hz (a

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Question ID VK-070347