A Question

A longitudinal wave travels through a medium composed of particles with their equilibrium positions shown in Figure (a). At a certain instant, the particles are displaced and their positions are shown in Figure (b). It is found that the particle C is moving to the left at that instant.

(a) What is the wavelength of the wave?

(b) What is the amplitude of the wave?

(c) In what direction is the wave traveling?

(d) In what directions are the particles A, B, D and E moving in Figure (b)?






Answer: (a) wavelength = 40 cm, (b) amplitude = 5 cm, (c) to left (d) A: momentarily at rest, B: to left, D: to right, E: to right