What Was the Temperature of the Universe When a Typical

question 18

Multiple Choice

What was the temperature of the universe when a typical CBR photon was no longer able to spontaneously create an electron and positron 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 electron is .

• A) 2,000 K
• B) 400,000 K
• C) 4 million K
• D) 2 billion K

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