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Hi guys, I'm in a pickle here with an assignment.
I'm required to find the redshift at which the energy density in radiation equals the energy density in matter.
The following are the givens we were...well, given:
1) assume 1 baryon = 10^9 photon
2) assume all photons have energy to the wavelength of the peak of a 2.73K black-body radiation curve
3) scale factor (a) of matter: Pm = a^-3
4) scale factor of radiation: Pr = a^-4
5) we are to work out the energy density of a photon & baryon in present time and then apply the scale factor
Apparently this isn't using complicated formulas, just simple E=mc^2 & E=h*nu.
me right now = lost...need major help
Thanks in advance
I'm required to find the redshift at which the energy density in radiation equals the energy density in matter.
The following are the givens we were...well, given:
1) assume 1 baryon = 10^9 photon
2) assume all photons have energy to the wavelength of the peak of a 2.73K black-body radiation curve
3) scale factor (a) of matter: Pm = a^-3
4) scale factor of radiation: Pr = a^-4
5) we are to work out the energy density of a photon & baryon in present time and then apply the scale factor
Apparently this isn't using complicated formulas, just simple E=mc^2 & E=h*nu.
me right now = lost...need major help
Thanks in advance