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MHT CET Physics question

PhysicsWavesMHT CET

Tuning fork A has a frequency of 305 Hz and it observed to produce 5 beats/second with another tuning fork B. When tuning fork B is filed, it produces 3 beats/s with A. The frequency of B before filing was

Answer: (A)

Solution

is 300 Hz or 310 Hz; filing raises , so the beats fall to 3 only if was 300 Hz (rising to 302 Hz),

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Question ID VK-070197