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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: 
$$f' = f \dfrac{v+v_o}{v-v_s}$$
where $$f = $$ frequency of source
$$f' = $$ Doppler frequency 
$$v = $$ speed of wave
$$v_o = $$ speed of observer
$$v_s = $$ speed of source

Physics

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