Fr what energy can we use boltzmann statistics assume ef

Question

We stated in the text that the Fenni distribution function can be approximated by classical Boltzmann statistics if the exponential factor in the Fenni distribution function is significantly larger than one

(a) Calculate E - E_F = nk_BT for various values of n and state at which value for n, can be considered to be "significantly larger" than I (assume T = 300 K).

(b) For what energy can we use Boltzmann statistics? (Assume E_F = 5 eV and E - E_F = 4k_BT.)