AP and TS EAMCET Medical Model Paper 8

A source of sound ‘S’ produces sound of frequency 640Hz as it moves towards point ‘A’ with a 100 . speed of

100

3

m∕s. The sound produced by the source when it is at a distance of ‘3m’ from ‘A’ is heard by a stationary observer located at ‘o’ 4m away from ‘A’as shown. If the velcoity of sound is 340 m/s, the apparent frequency of sound as heard by the observer is