The mirrors in LIGO hang as pendulums in a vacuum to:

  1. isolate them from vibrations and air disturbances
  2. reflect sound
  3. keep them warm
  4. make them heavier
Answer

A) isolate them from vibrations and air disturbances

Noise reduction. SLO P-11-D-21 · Understanding

Physics MCQ · More Gravitational Waves MCQs · Practise