Constructive and destructive interference waves

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Destructive interference: a crest and trough meet ( the waves are “out of phase “), the energies combine to work against each other – they tend to cancel out

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Constructive interference: when a crest from one source meets a crest from another source, the energies combine to displace the medium ( the energies are additive )

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Standing waves : when interferencing waves have the same amplitude and wave length l, resulting interference pattern remains nearly stationary and is called as standing wave interference pattern ; a node or nodel points is a point that remains at rest throughout the interference of the pulses

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