Superposition, phase difference, path difference and inteference

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Last updated 4:40 PM on 3/16/26
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5 Terms

1
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What is superposition?

When two waves interact the resultant displacement is the vector sum of the individual displacements

2
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What is coherence?

Two waves are coherent when they have a constant phase difference

3
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What are the conditions for constructive interference?

0 degrees phase difference between the two waves which interact. Path difference is a multiple of the wavelength

4
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What other degrees can phase difference be?

Any multiple of 360

5
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What are the conditions for destructive interference?

Phase difference of 180 degrees (waves in antiphase). Path difference of (n+1/2) wavelength