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MHT CET Physics question

PhysicsWavesMHT CET

When two tuning forks and are sounded together, 4 beats per second are heard. The frequency of the fork is 384 Hz. When one of the prongs of the fork is filed and sounded with , the beat frequency increases, then the frequency of the fork is

Answer: (D)

Solution

= 380 or 388 Hz; filing a prong raises the frequency of , which increases the beats only if is already above ,

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Question ID VK-070301