IB Physics HL C 3 6 Coherence Questions

Practise IB Physics HL C.3.6 by solving coherence, phase and fringe-visibility problems for double-slit and multi-source interference.

Exam points

Solve coherence and fringe-visibility conditions using frequency, phase and path relationships.
Determine phase differences and predict constructive or destructive interference at specified points.
Explain why coherent sources are required for stable interference intensity and visible fringes.

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Study C.3.6—Coherence conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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A beam of coherent monochromatic light from a distant galaxy is used in an optics experiment on Earth.

The beam is incident normally on a double slit. The distance between the slits is 0.300 mm . A screen is at a distance D from the slits. The diffraction angle $\theta$ is labelled.

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Outline why the beam has to be coherent in order for the fringes to be visible.

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IB Physics HL C 3 6 Coherence Questions question 1