If the wavelength of the background radiation peaked at 1 μm at the time of recombination,how old was the universe then compared to its age today?
A)1/10th as old
B)1/100th as old
C)1/1,000th as old
D)1/10,000th as old
E)1/100,000 as old

Question

Quizplus · Accepted Answer

The wavelength of the cosmic microwave background radiation has stretched by a factor of about 1,000 since the time of recombination due to the expansion of the universe. This implies that the universe was approximately 1/1,000th of its current age at that time.

If the Wavelength of the Background Radiation Peaked at 1