If given wave has propagation constant $\frac{5 \pi}{7}\, rad/m$ then phase difference between two particle having distance difference $\frac{49}{22} \,m$ is ..... $rad.$
A$5$
B$10$
C$2.5$
D$5/7$
Medium
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A$5$
a $\boxed{\Delta \phi = kx}$
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