Progressive Wave Equation
The diagram shows the propagation of a progressive wave. A, B, C, D, E are five points on this wave

Which of the following points are in the same state of vibration?
Show answer and solution
Answer: (d)
- Points in the same state of vibration have the same displacement and the same direction of motion (phase difference ).
- B and E both have the same positive displacement and both lie on the falling side of a crest.
- B and E are two full wavelengths apart, so they are in phase.
- So the answer is (d) E, B.