A rocket is moving at speed of 200m/sec towards a stationary target. While moving, it emits a wave of frequency 1000hz. Some of the sound reaching the target reflected back to the rocket as an echo. Calculate the frequency of the sound as detected by the target
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apparent frequency received by the target
=f1=1000[330/(330-200)]
the sound gets refelcted thus the apparent frequency received by the rocket is
=f2=f1[(330+200)/330]=1000[(330+200)/(330-200)]
=1000×(530/130)
=4076.923 Hz
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