Which condition is needed for a stable interference pattern?

  1. the sources must be very bright
  2. the waves must be longitudinal
  3. the sources must be different colours
  4. the sources must be coherent
Answer

D) the sources must be coherent

Constant phase difference. SLO P-11-D-08 · Understanding

Physics MCQ · More Superposition, Stationary Waves and Beats MCQs · Practise