ch35-p028 - 28. The problem asks for the greatest value of...

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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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