What was the temperature of the universe when a typical CMB photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to E = hc/$\lambda$, the CBR at any point in time has a blackbody spectrum that peaks at $\lambda$_peak = (2,900 $\mu$m K)/T, and the mass of a single proton is 1.7 *10^-²⁷ kg.

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The Answer of What was the temperature of the universe when a typical CMB photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to E = hc/$\lambda$, the CBR at any point in time has a blackbody spectrum that peaks at $\lambda$_peak = (2,900 $\mu$m K)/T, and the mass of a single proton is 1.7 *10^-²⁷ kg.

What Was the Temperature of the Universe When a Typical λ\lambdaλ

What Was the Temperature of the Universe When a Typical $\lambda$