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NEETPhysicsWaves and Sound

Assertion: Doppler effect does not depend upon the distance between source and observer. Reason: If source and observer are moving with same velocities, then no Doppler effect will be observed.

Options

  1. AIf both Assertion and Reason are correct 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 Assertion is false but Reason is true.

Correct answer

A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Step-by-step solution

Assertion is correct. The Doppler effect (change in frequency) depends on the relative velocity between the source and the observer, not the distance between them. Reason is correct. If the source and observer move with the same velocity in the same direction, their relative velocity is zero. Therefore, there is no Doppler shift. The reason is a correct explanation of the assertion. The principle of relative velocity in the reason directly supports the assertion that distance is irrelevant.

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