It means Constructive interference has occurred.
Explanation:
Waves travelling from opposite sides can collide to results into constructive interference or destructive interference.
In constructive interference, the crust of the waves merge.This results into increase in energy.In destructive interference the two waves cancel each other to cause loss of energy.
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Constructive interference : https://brainly.com/question/2413750
Keyword : experiment, wave, energy
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