(A) : Intensity of sound heard changes when an observer moves towards or away from a stationary source.
(R) : The motion of observer causes apparent change in wavelength.

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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 C.

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Detailed Solution

Intensity of sound heard changes when an observer moves towards or away from a stationary source.

Intensity of sound at any point is dependent upon frequency as well as amplitude . As due to Doppler effect the apparent frequency changes , so intensity as perceived by the listener also changes .
The motion of observer causes apparent change in frequency due to greater number of interception of wavefronts.

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