Sun February 10, 2013 By:

A policeman blows a whistle of frequency 300Hz as a car speeds past him with a velocity of 18 km/hr .find the change in frequency as heard by the driver of the car just as he passes the policeman.velocity of sound is 340m/s

Expert Reply
Mon February 11, 2013
due to the doppler effect, the change in frequency will be,
v = velocity of sound
fo = frequency of whistle
f = frequency heard by observer
vs = velocity of observer
f = fo (1+vs/v)
thus now change in frquency can be calculated.
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