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(D) Two points are in the same state of vibration (same phase) if they have the same displacement and are moving in the same direction. This occurs at

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$B, E$

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(D) Two points are in the same state of vibration (same phase) if they have the same displacement and are moving in the same direction. This occurs at points separated by an integer multiple of the wavelength $\lambda$. Looking at the diagram,point $B$ is on the downward slope of the first crest. Point $E$ is on the downward slope of the third crest. The distance between $B$ and $E$ is exactly one full wavelength $\lambda$. Therefore,points $B$ and $E$ are in the same phase.

The diagram shows the propagation of a progressive wave. $A$,$B$,$C$,$D$,$E$,and $F$ are points on this wave. Which of the following points are in the same state of vibration (i.e.,in the same phase)?

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