The displacement of particles in a string stretched in the -direction is represented by

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

The displacement of particles in a string stretched in the

x

-direction is represented by

y

. Among the following expressions for

y

, those describing wave motion are : (1)

\cos kx \sin \omega t

(2)

k^2 x^2 - \omega^2 t^2

(3)

\cos^2(kx + \omega t)

(4)

\cos (k^2 x^2 - \omega^2 t^2)