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Imagine two electromagnetic waves are traveling in opposing directions such that they eventually meet, overlap, and continue traveling as usual after the superposition/overlapping event. Just before they overlap there is some superposition effect taking place but not enough to fully merge the two waves. They are at this point only partially merged and there are two peaks fairly close together forming what looks like a higher frequency pair of waves, would the resulting peaks being closer together affect the apparent frequency of the overall wave? I am also interested in the answer to this where both waves are traveling in the same direction but in the same semi-merged state with two peaks close together.
The event I am trying to describe is at time t2 and t4 in the image bellow
The event I am trying to describe is at time t2 and t4 in the image bellow