The diagram shows the propagation of a wave. Which points are in same phase?

The diagram shows the propagation of a wave. Which points are in same phase? A sinusoidal wave graph showing points B, C, D, E, F, G along the path on X and Y axes.
  1. F and G
  2. C and E
  3. B and G
  4. B and F

Solution

Points $B$ and $F$ are in same phase as they are $\lambda$ distance apart.

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