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A-LevelPhysicsSuperposition9702/12 · May/June 2019 · Q301 Mark

Why can an observable interference pattern never be obtained between two monochromatic beams of light from different lamps?

AThe frequency of the light from the two lamps can never be the same.
BThe light from the two lamps can never be coherent.
CThe temperature of the filaments of the two lamps used can never be the same.
DThe wavelength of the light from the two lamps must always be different.

✓ Correct answer

B: The light from the two lamps can never be coherent.

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About this question

Topic
Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source
A-Level Physics, May/June 2019 Paper 1 Variant 2, question 30.

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