Answer
a. $3.1\times10^4K$
b. $9.3\times10^2K$
Work Step by Step
Use the relationship that is given.
$$KE=\frac{3}{2}kT$$
a. $T = \frac{2(KE)}{3k}=\frac{2(4.0 eV)(1.60\times10^{-19}J/eV)}{3(1.38\times10^{-23}J/K)}=3.1\times10^4K$
b. $T = \frac{2(KE)}{3k}=\frac{2(0.12 eV)(1.60\times10^{-19}J/eV)}{3(1.38\times10^{-23}J/K)}=9.3\times10^2K$
