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MHT CET202012 Oct 2020Morning ShiftPhysicsWaves and SoundActual

The frequency of two tuning forks A and B are 1 5 % more and 2 5 % less than that of the tuning fork C . When A and B are sounded together, 12 beats are produced in 1 second. The frequency of tuning fork C is

Options

  1. A200 ~Hz
  2. B300 ~Hz
  3. C240 ~Hz
  4. D360 ~Hz

Correct answer

B. 300 ~Hz

Step-by-step solution

f _ A = f _ c 1.015 f _ B = f _ c 0.975 f _ A - f _ B =12(1.015-0.975) f _ c =120.040 f _ c =12 f = 12 0.040 =300 ~Hz

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