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A train is passing a stationary observer...

A train is passing a stationary observer at station with constant velcity. If the frequency observed by the person during its approches and recession are `2.2 kHz` and `1.8 kHz` respectively. Then find the velocity of train if the velocity of sound in air in air is `300 m//s`.

Text Solution

Verified by Experts

The correct Answer is:
`V_(S) = 30 m//s`
`1.8 xx 10^(2) = (300)/(300 + v_(5)) xx f , 2.2 xx 10^(3) = (300)/(300 - V_(s))f rArr V_(s) = 30 m//s`
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Knowledge Check

  • Two trains A and B are approaching a platfrom from opposite directions .The siren in the station is making a sound at a frequency 4kHz.The passengers in trains A and B hear siren at frequencies 4.5 and 5kHz respectively.Then the velocities of the trains A and B are (velocity of sound in air =340 m/s)

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