In which of these cases are the two wave points considered to be in phase with each other?
A) One point is on a crest and the other point is on a trough.
B) One point is at the equilibrium position and the other point is on a trough.
C) One point is at the equilibrium position and the other point is on a crest.
D) The two points are both on troughs
D
these are 'in phase'
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