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Two progressive waves travel in the same direction in a medium. The amplitude of each wave is A and the phase difference between the two waves is $120^{0}$ The resultant amplitude will be.

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$\sqrt{2 A}$

answer is C.

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Detailed Solution

$P = \sqrt{P^{2} + Q^{2} + 2 P Q \cos θ}$

$\sqrt{A^{2} + A^{2} + 2 A^{2} \cos^{2} 120^{O}} = A$

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