Two particles A and B have a phase diference of `pi` when a sine wave passes through the regin

Options

A. The displacements at `A` and `B` have equal magnitudes
B. `A` and `B` move in opposite directions
C. `A` and `B` must be separted by half of the wavelength
D. `A` oscillates at half the frequency of `B`

Answer

A, B

Explanation

Phase difference of `pi` means that the displacement of two particles `A` and `B` are equal in magnitude and opposite in direction. `A` and `B` may be separated by half wavelength if they have same frequency of oscillation.