Question

In progressive wave,

(a) all particles of medium vibrate

(b) the amplitude of vibration is the same for all particles

(c) Both (a) and (b)

(d) some particles of medium vibrate

Answer 1

(c) Both (a) and (b)

In a stationary wave, all the particles between consecutive nodes vibrate in phase. The particles on the different sides of a node do not vibrate in phase but they have a phase difference of π. So the alternate parts between the consecutive nodes vibrate in phase.