Question 39 of 142

A progressive wave travelling along the positive $x-$ direction is represented by $y\left(x,t\right)=Asin(kx-\omega t+\phi )$ . Its snapshot at $t=0$ is given in the figure.

For this wave, the phase $\phi$ is:

A$\dfrac{\pi }{2}$B$0$C$\pi$D$-\dfrac{\pi }{2}$

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Answer: (C) $\pi$

$y=A\sin (kx-\omega t+\phi )$
at $x=0,t=0,y=0$ and slope is negative
$\Rightarrow \phi =\pi$