A source of sound S is moving with a velocity of 50 m s - 1 towards a stationary observer. The observer measures the frequency of the source as 1000 Hz . What will be the apparent frequency of the sou

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A source of sound S is moving with a velocity of 50 m s - 1 towards a stationary observer. The observer measures the frequency of the source as 1000 Hz . What will be the apparent frequency of the source when it is moving away from the observer after crossing him? The velocity of the sound in the medium is 350 m s - 1 .

TestHub · Accepted Answer

Here, u s = 50 m s - 1 , v L = 0 , u = 350 m s - 1 When the source is moving towards the observer, ν ′ = 1000 ν ′ = u × ν u - u s ν = u - u s ν ′ u = ( 350 - 50 ) 1000 350 = 6000 7 H z When the source is moving away from the observer, ν ′ = u × ν u + v s = 350 ( 350 + 50 ) × 6000 7 = 750 H z

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