Question

A conveyor belt moves to the right will a speed $v=300m/min$. 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.
If the piemaker is stationary, find the spacing $\lambda$ between the pies and the frequency $f$ with which they are received by the stationary pie eater.

Answer 1

$v=\frac{300m}{60s}=5m/s$

$f=\frac{20}{60}=\frac{1}{3}/sec$

$T=\frac{1}{f}=3sec$

$\lambda =v\times T=5\times 3=15m$