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MHT CET Physics question

PhysicsWavesMHT CET

When a tuning fork A and B are sounded together, the number of beats heard are 4 per second. When tuning fork A is filed, the number of beats heard per second with B is changed to 3. If the frequency of tuning fork B is 384 Hz, the original frequency of A is

Answer: (D)

Solution

is 388 Hz or 380 Hz; filing raises , which reduces the beats only if was 380 Hz (rising to 381 Hz),

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Question ID VK-070193