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

• A. A
• B. 2A
• C. 4A
• D.

Answer 1

The correct option is A

A

$A_1=A_2$

$A_{net}=\sqrt{A^2+A^2+2A^{2}cos{120}^{\circ }}$

$A_{net}=A$