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NEET2011PhysicsWaves and SoundActual

A tuning fork A produces 4 beats/s with another tuning fork B of frequency 320 Hz . On filing one of the prongs of A, 4 beats / s are again heard when sounded with the same fork B . Then, the frequency of the fork A before filing is

Options

  1. A328 Hz
  2. B316 Hz
  3. C324 Hz
  4. D320 Hz

Correct answer

D. 320 Hz

Step-by-step solution

There are 4 beats between A and B , therefore the possible frequencies of A are 316 or 324 that is (320 4) Hz . When the prong of A is filed, its frequency becomes greater than the original frequency. If we assume that original frequency of A is 324 then on filing its frequency will be greater than 324 . The beats between A and B will be more than 4 . But it is given that the beats are again 4 , therefore, 324 is not possible. Therefore, required frequency must be 316 Hz . (This is true, because on filing the frequ

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