Question

The particle of a medium vibrates about their mean position whenever a wave travels through that medium. The phase difference between the vibrations of two such particles

• A. varies with time only
• B. varies with distance separating them only
• C. varies with time as well as distance
• D. is always zero

Answer 1

Answer: (B)

varies with distance separating them only

The phase difference between the vibrations of two particles of the medium is given by :

$\Delta \varphi =\frac{2\pi }{\lambda }\Delta x$

it is clear that phase difference varies as the path difference between the particles varies, which is the distance, separating the particles.