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MHT CET Physics question

PhysicsWavesMHT CET

Two tuning forks produce 4 beats per second when sounded together. The frequency of one of them is 200 Hz. When the other tuning fork is loaded with a little wax, the beats stop. The frequency of second tuning fork is

Answer: (B)

Solution

Waxing lowers the second fork's frequency, and the beats vanish, so it must have been Hz and fell to 200 Hz;

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Question ID VK-070103