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Question

A conveyor belt moves to the right will a speed v=300 m/min. A very fast piemaker puts pies on the belt at a rate of 20 per minute, and they are received at the other end by a pie eater.
Repeat your calculation for a stationary piemaker and a pie eater who moves toward the piemaker at 30 m/min.

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Solution

We have to use the concept of Doppler's effect here

v=300m60s=5m/s

f=2060=13/sec

vo=3060=0.5m/s , vs=0

f=f(vvovvs)=13(5+0.55)

f=1130Hz

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