If the CMB hadn\'t been discovered yet, but we wanted to predict what temperatur

Question

If the CMB hadn't been discovered yet, but we wanted to predict what temperature scientists should find it at, what two pieces of information would we need? In other words, what information would we need in order to calculate the current temperature of the CMB (without measuring it)? We would need

which of the following? (choose one)

A)the number of black holes in the universe

b) it's initial density

c)the cause of recombination

d)its initial temperature

and we also need which of the following

a)the number of photons emitted

b)the ratio of matter to anitmatter

c)how the universe became transparent

d)how long the radiation has been traveling

Explanation / Answer

In order to find the temperature of cmb we need to find the cause of recombination as well as we also need to find the numbers of photon emitted at the time of recombination so that we can calulate the temperature of cmb

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