Flashcards
Superposition and coherence
Cards in this deck (11)
- 1When will superposition happenWhen two or more waves pass through each other
- 2State the principle of superpositionWhen two or more waves cross, the resultant displacement equals the vector sum of the individual displacements
- 3Give example of constructive interferenceCrest plus crest or trough plus trough give a bigger crest or bigger trough
- 4Define constructive interferenceIf two waves are in phase ten the maximum positive displacements from each wave line up creating a resultant displacement with an increased amplitude: meaning intensity will also increase because intensity is directly proportional to amplitude squared
- 5What is destructive interferenceIf two progressive waves are in anti phase then the maximum positive displacement from one of the waves lines up with the maximum negative displacement from the other, the resultant displacement is smaller than for each individual wave .
- 6When will two sources be coherent?If they have the same wavelength and frequency and a fixed phase difference between them
- 7Define path differenceHow much further one wave has travelled from the other wave from the same source
- 8Path difference and phase difference at central maximaZero for both
- 9Path difference at first order minima and first order maximaLamda/2
- 10What is good about laser lightCoherent frequency and wavelength the same) and monochromatic (one wavelength present only)
- 11Why is monochromatic laser light used when demonstrating two source interference?One wavelength only which is about same size as the slit so it can be diffracted to produce a clear interference pattern
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- Flashcards on Superposition and coherence , created by abbie Fitzpatrick on 04/07/2017.
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- abbie Fitzpatrick
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