Two waves of equal amplitude and wavelength but differing in phase are superimposed. The amplitu...

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Two waves of equal amplitude and wavelength but differing in phase are superimposed. The amplitude of the resultant wave is maximum when phase difference is :
(A) zero
(B) \( \frac{\pi}{2} \)
(C) \( \pi \)
(D) \( \frac{3 \pi}{2} \)
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