In the nuclear fusion reaction ${}_1^2{\rm{H}}\,\, + \,\,{}_1^3{\rm{H}} \to {}_2^4{\rm{H}}e\,\, + \,\,n$ <br> given that the repulsive potential energy between the two nuclei is $7.7\,\, \times \,\,{10^{ - 14}}{\rm{ J}}$, the temperature at which the gases must be heated to initiate the reaction is nearly [Boltzmann’s constant $k = 1.38\,\, \times \,\,{10^{ - 23}}\,\,{\rm{J}}{{\rm{K}}^{