Two waves of equal amplitude and wavelength but differing in phase ...

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Two waves of equal amplitude and wavelength but differing in phase are superimposed. The amplitude
\( \mathrm{P} \)
of the resultant wave is maximum when phase
W
difference is:
(1) zero
(2) \( \frac{\pi}{2} \)
(3) \( \pi \)
(4) \( \frac{3 \pi}{2} \)
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