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28. The problem asks for “the greatest value of
x
… exactly out of phase” which is to be
interpreted as the value of
x
where the curve shown in the figure passes through a phase
value of
π
radians.
This happens as some point
P
on the
x
axis, which is, of course, a
distance
x
from the top source and (using Pythagoras’ theorem) a distance
d
2
+
x
2
from
the bottom source.
The difference (in normal length units) is therefore
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 Spring '08
 Any
 Physics

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