Two waves of equal amplitude \( A \) and equal frequency travel in the same direction in a mediu...

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Two waves of equal amplitude \( A \) and equal frequency travel in the same direction in a medium having phase difference of \( \phi \). The amplitude of the resultant wave is
(a) 0
(b) \( A \)
(c) \( 2 A \)
(d) between 0 to \( 2 A \)
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