Two particles \( A \) and \( B \) have a phase difference of \( \pi...

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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 directions.
(c) \( A \) and \( B \) must be separated by half of the wavelength.
(d) The displacements at \( A \) and \( B \) have equal magnitudes.
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