MCQ
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
- ✓$\pi $
- B$\frac{\pi }{2}$
- C$-\frac{\pi }{2}$
- D$0$
