Suppose we observe radiation emitted from a quasar to have a wavelength of63cm.During the journey to arrive at our telescope,the scale of the Universe grew by a factor of three. What was the wavelength of the radiation when it was emitted from the quasar?

1 Answer
Feb 14, 2018

63cm

Explanation:

That sounds like a very ill-posed question! As an energetic wave, the wavelength would not change just because its surroundings did. How long it might take to traverse a particular expanding distance might change, but the energy of the wave itself would be unaffected.