(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The universe is expanding as shown by a hubble constant H of 75 Km s^-1 Mpc^-1, but a constant density of matter of 10^-26 kg m^-3 is maintained by the continuous creation of hydrogen atoms as the universe expands. Find the rate of creation of hydrogen atoms per unit volume.

dont really know how to go about this

2. Relevant equations

for a matter dominated universe, a~t^2/3 and rho~a^-3

3. The attempt at a solution

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# Homework Help: Cosmology-Application of the friedmann equation

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