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NEET2014PhysicsWaves and SoundActual

Assertion : To hear distinct beats, difference in frequencies of two sources should be less than 10 . Reason: More the number of beats per sec more difficult to hear them.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

According to the property of persistence of hearing, the impression of a sound heard persists on our mind for 1 10 sec . Therefore, number of beats per sec should be less than 10 . Hence difference in frequencies of two sources must be less than 10 . [beats per sec =v₂-v₁ ]

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