Two coherent sources in phase emit waves of wavelength lambda. At a point, the path difference is 2lambda. The interference there is:

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

D) constructive

Path difference = nlambda gives constructive; (n + 12)lambda gives destructive. Here 2lambda ⇒ constructive. SLO P-11-D-07 · Application

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