$A$ transverse progressive wave on a stretched string has a velocity of $10\,m/s$ and a frequency of $100\,Hz$. The phase difference between two particles of the string which are $2.5\,cm$ apart will be:
- A$\frac{\pi}{8}$
- B$\frac{\pi}{4}$
- C$\frac{3\pi}{8}$
- D$\frac{\pi}{2}$
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