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Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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An Intiative by Sri Chaitanya

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is D.

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Detailed Solution

When an observer in motion ‘passes by’ a stationary source the apparent frequency heard first has higher value and after passing has lower value. It doesn't change continuously.

Relative motion between observer and source is responsible for the change in frequency.

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