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Byju's Answer

Standard XII

Physics

Doppler Effect in Light Waves

Assertion :In...

Question

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.

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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Assertion is incorrect but Reason are correct

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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
Motion of listener brings change in frequency and motion of source leads to change in wavelength.
Intensity increases as listener moves closer as he encounter more sound waves than before.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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