Question

Which of the following equations represents a wave travelling along Y-axis?
(a) $x=A\sin \left(ky-\omega t\right)$
(b) $y=A\sin \left(kx-\omega t\right)$
(c) $y=A\sin ky\cos \omega t$
(d) $y=A\cos ky\sin \omega t$.

Answer 1

(a) $x=A\sin \left(ky-\omega t\right)$

Here x is the particle displacement of the wave and the wave is travelling along the Y-axis because the particle displacement is perpendicular to the direction of wave motion.