Question

The phase difference between two points on a progressive wave is 3𝜋/4

. What will be the

corresponding path difference?

Answer 1

The phase difference is related with path difference by an equation

$$\Delta\phi=\frac{2\pi}{\lambda}\Delta x$$

So

$$\Delta x=\frac{\Delta \phi}{2\pi}\lambda=\frac{3\pi/4}{2\pi}\lambda=\frac{3\lambda}{8}$$