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

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If assertion is false but the reason is true

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true ,but the reason is false

If both assertion and reason are true and the reason is correct explanation of the assertion

answer is D.

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