Note AcademyNote Academy
Start

Physics (AS & A Level) · Oct / Nov 2025 · Paper 14 · Question 31

9702Interference

Two light sources are used to produce an interference pattern. Interference fringes appear when the two sources emit waves that are coherent. What is meant by coherent waves?

  1. AThe two waves are emitted with the same frequency.
  2. BThe two waves are emitted with constant phase difference.
  3. CThe two waves are emitted with the same intensity.
  4. DThe two waves are emitted with zero phase difference.

As printed in the paper

Show the answer

Correct answer: B. The two waves are emitted with constant phase difference.

Sit this whole paper →More on Interference

Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.