A plane progressive wave of frequency 25 Hz, amplitude `2.5 xx 10^(-5) m` and initial phase zero moves along the negative x-direction with a velocity of 300 m/s. A and B are two points 6 m apart on the line of propagation of the wave. At any instant the phase different between A and B is `phi`. The maximum difference in the displacements of particle at A and B is `Delta`

Options

A. `phi = pi`
B. `phi = 0`
C. `Delta =0`
D. `Delta = 5 xx 10^(-5)` m

Answer

A, D

Explanation

`lamda=(300 m//s)/(25 Hz)=12 m`
Separation between A and B `=6 m=lamda//2`