First slide

Doppler

Question

A source of sound produces waves of wavelength 60 cm when it is stationary. If the speed of sound in air is 320 m/s and source moves with speed 20 m/s, the wavelength of sound in the forward direction will be nearest to

Easy

A

56 cm
B

60 cm
C

64 cm
D

68 cm

Solution

$λ' = (\frac{v - v_{s}}{v}) λ = (\frac{320 - 20}{320}) 60$ = 56.25cm

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