What was the temperature of the universe when a typical CBR photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to ,the CBR at any point in time has a blackbody spectrum that peaks at ,and the mass of a single proton is .

Question

What was the temperature of the universe when a typical CBR photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to  ,the CBR at any point in time has a blackbody spectrum that peaks at  ,and the mass of a single proton is  .

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The Answer of What was the temperature of the universe when a typical CBR photon was no longer able to spontaneously create a proton and antiproton pair? Note that a photon has an energy equal to  ,the CBR at any point in time has a blackbody spectrum that peaks at  ,and the mass of a single proton is  .

What Was the Temperature of the Universe When a Typical