Q. 275.0( 1 Vote )

A train standing

Answer :

Given:


Frequency of whistle = 400 Hz


Speed of train = 10 ms-1


When the train starts moving the source of the sound is also moving from the observer, thus the waves emitted by the source starts shifting as the train moves which creates a change in frequency of the sound reaching the observer. This effect is called Doppler effect. The apparent frequency of the sound for the observer is given by the relation,



Where v is the speed of sound in air, vt is the speed of the train and f is the original frequency.



Therefore the sound reaching the observer will have a frequency of 412.5 Hz.


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