The microphone in noise-cancelling headphones is used to:

  1. record music
  2. measure temperature
  3. amplify the noise
  4. detect the incoming noise so an opposite wave can be generated
Answer

D) detect the incoming noise so an opposite wave can be generated

Feeds the processing circuit. SLO P-11-D-09 · Understanding

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