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A progressive wave travelling along the positive $x$-direction is represented by $y(x,t) = A\sin(kx - \omega t + \phi)$. Its snapshot at $t = 0$ is given in the figure.
For this wave, the phase $\phi$ is :
(1) $-\frac{\pi}{2}$
(2) $\pi$
(3) 0
(4) $\frac{\pi}{2}$
At $t = 0$, $x = 0$, $y = 0$
$\therefore \phi = \pi$ rad
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