Assertion :A sound source is approaching towards a stationary observer along the line joining them. Then apparent frequency to the observer will go on increasing. Reason: If there is no relative motion between source and observer apparent frequency is equal to the actual frequency.

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
A sound source is approaching towards a stationary observer along the line joining them. Then apparent frequency to the observer will first increase then decreases.
hence assertion is incorrect.
If there is no relative motion between source and observer apparent frequency is equal to the actual frequency.
hence reason is correct.

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