Rank These Times Based on the Wavelength of the Peak

Multiple Choice

Rank these times based on the wavelength of the peak intensity of the cosmic background radiation at those times, from shortest to longest. (Hint: consider how the temperature of the universe or the cosmic background radiation changed with time.)

A) 100 million years after the Big Bang, 1 million years after the Big Bang, today
B) today, 100 million years after the Big Bang, 1 million years after the Big Bang
C) 1 million years after the Big Bang, 100 million years after the Big Bang, today
D) today, 1 million years after the Big Bang, 100 million years after the Big Bang