Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 30
9702Interference
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.
As printed in the paper
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Correct answer: B. The light from the two lamps can never be coherent.
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