A source is moving with constant speed vs=20 m/s towards a stationary observer due east of the source. Wind is blowing at the speed of 20 m/s at 60∘ north of east. The source has frequency 1000 Hz. If the speed of sound is 310 m/s, the frequency observed by the observer is approximately
Velocity of wind along source motion (v′w)=vwcos60∘
Velocity of sound (v)=310 m/s
For apparent frequency,
|Why this question?
Caution:- Be careful when taking the sign convention of wind velocity, source velocity and observer velocity in doppler effect.