A transverse progressive wave on a stretched string has a velocity of $10\,m{s^{ - 1}}$ 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$\frac{\pi }{2}$
Medium
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D$\frac{\pi }{2}$
d (d) $v = n\lambda \Rightarrow \lambda = 10\,\,cm$
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