A laser interferometer detects gravitational waves by measuring:

  1. radio signals
  2. tiny changes in the lengths of its arms using interference of laser light
  3. changes in temperature
  4. the brightness of stars
Answer

B) tiny changes in the lengths of its arms using interference of laser light

Arm lengths change differently. SLO P-11-D-21 · Understanding

Physics MCQ · More Gravitational Waves MCQs · Practise