Destructive interference in noise-cancelling headphones means the energy of the noise is:

  1. converted into electric charge
  2. converted into light
  3. destroyed completely
  4. not destroyed — energy is redistributed or not delivered to the ear
Answer

D) not destroyed — energy is redistributed or not delivered to the ear

Energy is conserved. SLO P-11-D-09 · Understanding

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