Question

What is the phase difference between two successive crests in the wave?

• A. $\pi$
• B. $\frac{\pi }{2}$
• C. $2\pi$
• D. $4\pi$

Answer 1

Answer: (C)

Relation of path difference and phase difference is given by
$\Delta \varphi =\frac{2\pi }{\lambda }\times \Delta x$
where $\Delta x$ is path difference.
But path difference between two crests
$\Delta x=\lambda$
Hence, $\Delta \varphi =\frac{2\pi }{\lambda }\times \lambda =2\pi$