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a source is moving with a constant speed of 20m/s towards a stationary observer due east of the source. wind is blowing at the speed of 20m/s at 60° north of east . the source has frequency 500Hz and speed of sound is 300m/s. what will be the approximate frequency registered by the observer

Harsha , 7 Years ago
Grade 11
anser 2 Answers
Saurabh Koranglekar

Last Activity: 5 Years ago

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Arun

Last Activity: 5 Years ago

Velocity of wind in the direction of sound i.e towards East          vw′​=vw​cos60o=20×0.5=10m/s
Let the apparent frequency heard by the stationary observer be   n′.
Using Doppler effect:        n′=n[vsound​+vw′​−vsource​vsound​+vw′​​]
 n′=500[300+10−20300+10​]
⟹n′=

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