Two particles \( A \) and \( B \) have a phase difference of \( \pi \) when a sine wave passes t...

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Two particles \( A \) and \( B \) have a phase difference of \( \pi \) when a sine wave passes through the region
(A) \( A \) oscillates at half the frequency of \( B \).
(B) \( A \) and \( B \) move in opposite direction.
(C) \( A \) and \( B \) must be separated by half of the wavelength.
(D) The displacement at \( A \) and \( B \) have equal magnitudes.
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