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Question

In doppler effect

A
only frequency changes
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B
both intensity and frequency change
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C
only speed changes.
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D
both speed and frequency change
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Solution

The correct option is A only frequency changes
Doppler effect is change in frequency or wavelength of a wave for an observer moving relative to source. The Doppler shift in frequency is given by:
f=fv+vovvs
where f= frequency of source
f= Doppler frequency
v= speed of wave
vo= speed of observer
vs= speed of source

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