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Doppler Effect in Light Waves

A fixed sourc...

Question

A fixed source emits sound of frequency 1000 Hz. What is the frequency as heard by a observer at rest?

A

900 H z

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B

1000 H z

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C

1080 H z

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D

700 H z

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Solution

The correct option is B $1000 H z$
Doppler effect is the apparent change in frequency of sound when the source, observer and medium are in the relative motion. As here the both source and observer are in rest, so we can not observe Doppler effect of sound. Thus, there is no change in frequency of sound as heard by observer. Therefore, the frequency of the sound as heard by observer will be the frequency of the source i.e. $1000$ Hz.

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