What will occur when the trough of Wave A overlaps the trough of Wave B?

A trough is a displacement in the same direction as another trough, so when the troughs overlap their displacements add. This is constructive interference, producing a wave with a greater amplitude and more energy than either wave alone at the overlap. The correct choice is “Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.”

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