Two waves represented by \( y 1=10 \sin (2000 \pi t+2 x) \) and \( ...

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Two waves represented by \( y 1=10 \sin (2000 \pi t+2 x) \) and \( y_{2}=10 \sin (2000 \pi t+2 x+\pi / 2) \) are superposed at any point at a particular instant. The resultant amplitude is
\( \mathrm{P} \)
(A) 10 units
(B) 20 units
(C) \( 14.1 \) units
(D) zero
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