A stationary source emits single frequency sound. A wall approaches it with velocity u = 33 cm/s. The propagation velocity of sound in the medium is v = 330 m/s. In what way and how much, in per cent, does the wavelength of sound change on reflection from the wall ?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
decreases by 
= 0.2 %
f ' = f 
Doppler effect between source and wall
f '' = f ' 
Doppler effect after reflection
f '' = f 
λ '' = 
= 
= λ 
× 100 = 
× 100 = 
× 100
= 
= –0.2 %
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