Question

# In doppler effect

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

Solution

## The correct option is A only frequency changesDoppler 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 sourcePhysics

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