Two sine waves travel in the same direction in a medium. The amplitude of each w

Question

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

Options:

A . A

B . 2A

C . 4A

D . √2A

Answer: Option A
:
A

A_{1} = A_{2}

A_{n e t} = \sqrt{A^{2} + A^{2} + 2 A^{2} c o s 120^{\circ}}

A_{n e t} = A

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