Two sine 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 $120^\circ$. The resultant amplitude will be

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A We know the resultant amplitude is given by R_{net} = \sqrt{A^2 + A^2 + 2 A^2 \cos 120 ^\circ\ } (\phi = 120^\circ\ ) = $\sqrt$(2 A^2 - A^2) \left[ \because \cos 120 ^\circ= - $\frac{1}{2}$ \right] = A

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