The distance between two points on a stretched string is 20 cm. A pregressive wave of frequency 400 hertz travels on the string with a velocity of `100m//s`. Calculate phase differency between the points.

Explanation

`lambda=(v)/(n)=(100)/(400)=0.25m`
`Deltaphi=(2pi)/(lambda)Deltax=(2pi)/(0.25)xx((20)/(100))=1.6piradian`