Question

Two wave pulses approaching each other are identical in shape except that one is inverted with respect to the other. At some instant the resultant displacement of particles from their mean position becomes zero. Then, at that instant velocity of the particles is

• A. Zero
• B. Non-zero
• C. Depends on distance between the pulses
• D. None of these

Answer 1

The correct option is B Non-zero

The net displacement of all the particles will be zero from their mean position, because of the superposition of inverted waves at that instant.

Howevere, the velocities of the particles will be non-zero, as the pulses get separated after interference and they will propagate in their respective directions.
$\therefore$ option $\left(b\right)$ is correct.