At what point do the weak nuclear and electromagnetic forces split?
A)never, they are still united
B)at $10^{12} \mathrm {~K} \text {, }$ 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 $10 ^ { - 15 } \mathrm {~K}$

Question

Quizplus · Accepted Answer

The weak nuclear and electromagnetic forces split after about $10^{-10}$ seconds, when the universe cooled down sufficiently, marking a significant event in the early universe's evolution.

At What Point Do the Weak Nuclear and Electromagnetic Forces 1012 K, 10^{12} \mathrm {~K} \text {, }1012 K,

At What Point Do the Weak Nuclear and Electromagnetic Forces $10^{12} \mathrm {~K} \text {, }$