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A sine wave has an amplitude \( A \) and a wavelength \( \lambda \). Let \( V \) be the wave velocity, and \( v \) be maximum velocity of particle in
\( \mathrm{P} \) the medium :

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(A) \( V \) cannot be equal to \( v \)
(B) \( V=v \), if \( A=\lambda / 2 \pi \)
(C) \( V=v \), if \( A=2 \pi \lambda \)
(D) \( V=v \), if \( \lambda=A / \pi \)
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