Assertion :The frequency of a sound wave changes as it travels from one medium to another medium. Reason: The velocity of the wave changes as well as the wavelength if the medium changes.

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 is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Movement of the source alters the wavelength and received frequency of the sound even though source frequency and source velocity are unchanged.
The source frequency does not change as sound wave travels from one medium to the other.

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