Two sine waves having equal frequency travel in the same direction in a medium. The amplitude of...

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Two sine waves having equal frequency travel in the same direction in a medium. The amplitude of each wave is \( A \) and the phase difference between the two waves is \( 120^{\circ} \). The resultant amplitude will be
(a) \( A \)
(b) \( 2 A \)
(c) \( 4 \mathrm{~A} \)
(d) \( \sqrt{2} A \)
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