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CAIE A-Level Physics AS 8.3.3 The Conditions Required If Two Source Interference Fringes Are to Be Questions

State the conditions required for stable two-source interference fringes.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • State the conditions required for stable two-source interference fringes.

CAIE A-Level Physics AS 8.3.3 The Conditions Required If Two Source Interference Fringes Are to Be Questions question 1

[Maximum number: 1]

Light of wavelength λ\lambda is emitted from two point sources R and S and falls onto a distant screen.

Figure for Question CAIE A-Level Physics AS 8.3.3 The Conditions Required If Two Source Interference Fringes Are to Be Questions question 1 — CAIE A-Level Physics AS

At point P on the screen, the light intensity is zero.
What could explain the zero intensity at P ?

A

Light from the two sources is emitted 180∘180^{\circ} out of phase and the path difference to P is 12λ\frac{1}{2} \lambda.

B

Light from the two sources is emitted in phase and the path difference to P is λ\lambda.

C

Light from the two sources is emitted 90∘90^{\circ} out of phase and the path difference to P is λ\lambda.

D

Light from the two sources is emitted in phase and the path difference to P is 12λ\frac{1}{2} \lambda.

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