Answer
$f = 5.5 \times 10^{-3}$
Work Step by Step
Use the equation $f = \frac{3kT}{2E_F}$
Where
$E_F=7.00 eV$
$k = 8.62 \times 10^{-5} eV/K$
At T = 300 K, Solve for f:
$f = \frac{(3)(8.62 \times 10^{-5} eV/K)(300 K)}{2(7.00 eV)}$
$f = 5.5 \times 10^{-3}$
