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How do interference happen ?

1 Answer
Mar 8, 2018


Superposition and Cancellation


When two identical waves pass each other, they can either have;

Constructive interference: when the 2 waves are in phase with each other, so the peaks and troughs superpose each other and double the amplitude

Destructive interference: This is the opposite of constructive, where the 2 waves are 180 degrees out of phase. As they're the same frequency, the 2 amplitudes are opposite, so cancel each other out creating a 'still' area