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MHT CET202123 Sep 2021Morning ShiftPhysicsWaves and SoundActual

A sonometer wire of length 25 ~cm vibrates in unison with a tuning fork. When its length in decreased by 1 ~cm , 6 beats are heard per second. What is the frequency of the tuning fork?

Options

  1. A200 ~Hz
  2. B72 ~Hz
  3. C100 ~Hz
  4. D144 ~Hz

Correct answer

D. 144 ~Hz

Step-by-step solution

When length decrease, the frequency of wire will increase. If n is the frequency of the tuning fork, then we have aligned & n 25=( n +6) 24 & n =144 ~Hz aligned

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