Question

A pulse on a string is shown in the figure. If $P$ is a particle of the string, then state which of the following are correct?

• A. If $P$ is stationary point, then pulse consists of two waves travelling towards each other
• B. If $P$ is moving upwards, then pulse is travelling in positive direction
• C. If $P$ is moving downwards, then pulse is travelling in negative direction
• D. none

Answer 1

Answer: (A), (B), (C)

The correct options are
A If $P$ is stationary point, then pulse consists of two waves travelling towards each other
B If $P$ is moving upwards, then pulse is travelling in positive direction
C If $P$ is moving downwards, then pulse is travelling in negative direction



$P$ can't be stationary if there is no interference.