P,Q and R are three particle of a medium which lie on the x-axis. A sin wave of wavelength `lamda` is travelling through the medium in the x-direction. P and Q always have the same speed. Whilem P and R always have the same velocity. The minimum distance between :-

Options

A. P and Q is `(lambda)/(2)`
B. `P and Q is `lambda`
C. `P and R is `(lambda)/(2)`
D. `P and R is `lambda`

Answer

A, D

Explanation

From the situation it is clear that particlesP and Q are in opposite phase so there path difference must be odd multiple of halfthe wavelength and particles P and R are in same phase so there path difference must be a multiple of wavelength hence option (A) and (D) are correct.