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 approximately:
Answer: Option A
:
A
Apparent frequency is given by:
n′=n(vv−vs)
For a medium, frequency is inversely proportional to wavelength.
λ′=(v−vsv)λ
λ′=(320−20320)60
λ′=56.25cm
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:
A
Apparent frequency is given by:
n′=n(vv−vs)
For a medium, frequency is inversely proportional to wavelength.
λ′=(v−vsv)λ
λ′=(320−20320)60
λ′=56.25cm
Was this answer helpful ?
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