About $1 \mu \mathrm { s }$ After the Big Bang, the Temperature of the Universe Was

Multiple Choice

About $1 \mu \mathrm { s }$ after the Big Bang, the temperature of the universe was about $10 ^ { 13 } \mathrm {~K}$ . What particle kinetic energy (in $\mathrm { eV } )$ does this correspond to? $\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , k = 1.38 \times 10 ^ { - 23 } \mathrm {~J} / \mathrm { K } \right)$

A) $1 \mathrm { TeV }$
B) $1 \mathrm { keV }$
C) $1 \mathrm { GeV }$
D) $1 \mathrm { MeV }$