Destructive interference occurs when two waves meet:

  1. in antiphase (crest on trough)
  2. at the same speed only
  3. with zero amplitude
  4. in phase
Answer

A) in antiphase (crest on trough)

Amplitudes subtract. SLO P-11-D-08 · Understanding

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