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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

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

Grade:11

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
2 years ago
576-1055_1.PNG
Arun
25757 Points
2 years ago
Velocity of wind in the direction of sound i.e towards East          vw=vwcos60o=20×0.5=10m/s
Let the apparent frequency heard by the stationary observer be   n.
Using Doppler effect:        n=n[vsound+vwvsourcevsound+vw]
 n=500[300+1020300+10]
n=

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