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  • A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz still air.

 A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz still air. The train beings to move with a speed of 10 m/s towards the platform. What is the frequency of the sound for an observer standing on the platform?

Answers (1)

v_{0}=400Hz and

V_{s}=\frac{10m}{s}given 

Velocity of sound in air

V_{a}=\frac{330m}{s}

Apparent frequency by the observer standing on the platform

v'=\frac{V_{a}}{V_{a}-V_{s} }v_{0}

v'=330\times \frac{400}{330-10}=412.5Hz 

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infoexpert24

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