If a train is moving toward you and at a speed of 50 m/sec and emits a whistle sound of pitch 1500 Hz, what will be the frequency with which you hear the pitch?
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Expert's answer
2011-06-07T05:53:23-0400
Frequency f0, then an observer stationary relative to the medium detects waves with a frequency f given by f = v/(v + vs) f0 where vs is positive if the source is moving away from the observer, and negative if the source is moving towards the observer. In this case v is the speed of sound ( approximately 343 m/s) Vs=-50 m/sec So f=(v/(v+vs )) f0
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