Problem C18:
One source produces a wave that varies in time as
y_{1}=A sin(ωt) at a certain position. Another
source produces a wave that varies in time as
y_{2}=-A cos(ωt + (n_{1}/n_{2})π)
at the same position. What is the net amplitude at this position
due to the two sources if they are coherent? If the displacement is:
y(t)=y_{1}+y_{2}=
√ n_{3}
A sin(ωt + φ),
what is n_{3}? Note that n_{1}, n_{2} and
n_{3} are unitless.

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