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  4. A progressive wave travelling along the positive x-direction is represented by y(x, t) = A sin (kx - ω t + φ). Its snapshot at t = 0 is given in the figure: For this wave , the phase φ is :

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Q. 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 :Physics Question Image

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Solution:

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

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