At What Point Do the Weak Nuclear and Electromagnetic Forces

question 39

Multiple Choice

At what point do the weak nuclear and electromagnetic forces split?

• A) never, they are still united
• B) at 10¹² K, when pair production starts for neutrons and protons
• C) at 10⁻⁴³ seconds, when all four forces separate as the Planck Era ends
• D) at about four seconds, when at millions of degrees hydrogen forms helium
• E) after about 10⁻¹⁰ seconds, when the temperature drops below 10⁻¹⁵ K

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