Two sound waves travel in the same direction in a medium. The amplitude of each wave is \( A \) ...

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Two sound 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
\( P \) amplitude will be.
(A) A
(B) \( 2 \mathrm{~A} \)
W
(C) \( 4 \mathrm{~A} \)
(D) \( \sqrt{2 \mathrm{~A}} \).
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