A wall is moving with constant velocity u towards a fixed source of sound of frequency 'f .The velocity of sound is 'v'. The wavelength of the sound reflected by the wall is
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a
vf
b
v-uf
c
v+uf
d
v-uv+u.vf
answer is D.
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Detailed Solution
Frequency of sound reflected by wall f' = v+uvf∴ Wavelength of sound reflected by wall= v-uf' = v-uv+u×vf