Assertion - Intensity of sound wave does not change when the listener moves towards or away from stationary.
Reason - The motion of listener causes the apparent change in wavelength.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The intensity of the sound at any point is defined as the amount of energy flowing per second per unit area around that point. This value will not change due to the motion of the listener in a particular direction. The motion of the listener changes the apparent wavelength of the sound only.

Therefore, the assertion and reason both are correct but the reason is not the correct explanation for the assertion.

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Q. Assertion :Intensity of sound wave changes when the listener moves towards or away from the stationary source. Reason: The motion of listener causes the apparent change in wavelength.

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