$A$ progressive wave of frequency $50 ~Hz$ is travelling with velocity $350 ~m/s$ through a medium. The change in phase at a given time interval of $0.01 ~s$ is
- A$\frac{\pi}{2} ~rad$
- B$\pi ~rad$
- C$\frac{\pi}{4} ~rad$
- D$\frac{3\pi}{2} ~rad$
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