The rotation of a star or a galaxy can be detected because:

  1. it stops emitting
  2. one side shows a red shift and the other a blue shift
  3. it changes colour completely
  4. it becomes brighter
Answer

B) one side shows a red shift and the other a blue shift

One side approaches, the other recedes. SLO P-11-D-04 · Understanding

Physics MCQ · More Wave Intensity and the Doppler Effect MCQs · Practise