If the phase difference between two sources changes randomly, the interference pattern:

  1. becomes brighter
  2. changes so fast that no steady pattern is seen
  3. is unaffected
  4. becomes sharper
Answer

B) changes so fast that no steady pattern is seen

Average intensity becomes uniform. SLO P-11-D-14 · Understanding

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