Constructive Interference:
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A constructive interference happens when 2 crests from different sources meet, and the energies combine and displace the medium.
Standing Wave
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A standing wave is when two or more waves have the same wavelength and amplitude, causing the pattern to remain nearly stationary, or also known as a standing wave interferance pattern.
Destructive Interference:
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A destructive interference is when a crest and a trough meet out of phase, and the energies work against each other, or cancel out each other.