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Wave Speed expression

Two particles...

Question

Two particles A and B have a phase difference of $π$ when a sine wave passes through the region.

A

A oscillates at half the frequency of B.

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B

A and B move in opposite directions.

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C

A and B must be separated by half of the wavelength.

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D

The displacements at A and B have equal magnitudes.

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Solution

The correct options are
B A and B move in opposite directions.
D The displacements at A and B have equal magnitudes.

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