Question

The displacement of a particle in string stretched in $X$ direction is represented by $y$. Among the following expressions for $y,$ those describing wave motions are

• A. $\cos kx\sin \omega t$
• B. $k^2{x}^2-{\omega }^2{t}^2$
• C. $\cos \left(kx+\omega t\right)$
• D. $\cos \left(k^2{x}^2-{\omega }^2{t}^2\right)$

Answer 1

The correct option is A $\cos kx\sin \omega t$

$y=A\cos kx\sin wt$

Hence,

option $\left(A\right)$ is correct answer.