A travelling wave reflected at an open boundary undergoes a phase change of [Kerala CEE 2013]

A travelling wave reflected at an open boundary undergoes a phase change of [Kerala CEE 2013]
  1. $\pi$
  2. $0$
  3. $\frac{\pi}{2}$
  4. $\frac{\pi}{3}$
  5. $\pi/4$

Solution

When a wave travels from denser medium, it gets reflected at the boundary of a rarer medium; it undergoes no phase change.

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