Model Paper 4 — Physics STD 11 Science — Question

Wave motion is a form of disturbance which travels through a medium due to repeated periodic motion of the particles of the medium about their mean positions.
Four important characteristics of wave motion are:
i. Wave motion is a form of disturbance which travels through a medium due to the vibrations of the particles of the medium.
ii. It is the disturbance which travels in the forward direction and not the particles. The particles simply vibrate about their mean position.
iii. The energy of a particle is wholly kinetic at the mean position and wholly potential at the extreme position.
iv. The motion of each particle begins a little later than that of its predecessor. In other words, there is always a constant phase difference between any two neighbouring particles. The wave always advances in that direction in which it meets particles with decreasing phase.