A progressive wave travelling along the positive $x-$ direction is represented by $y(x, t) = A\,sin\,\left( {kx - \omega t + \phi } \right)$. Its snapshot at $t = 0$ is given in the figure For this wave, the phase $\phi $ is
JEE MAIN 2019, Medium
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$y=A \sin (k x-w t+\phi)$
at $x=0, t=0$ and slope is negative
$\Rightarrow \phi=\pi$
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