Two coherent sources in phase emit waves of wavelength lambda. At a point, the path difference is 0.5lambda. The interference there is:

  1. neither — there is no interference
  2. constructive
  3. constructive only for sound
  4. destructive
Answer

D) destructive

Path difference = nlambda gives constructive; (n + 12)lambda gives destructive. Here 0.5lambda ⇒ destructive. SLO P-11-D-07 · Application

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