The Fermi Energy of Rubidium at a Temperature of 5

Multiple Choice

The Fermi energy of rubidium at a temperature of 5 K is 1.85 eV.An electron state in rubidium is 0.007 eV above the Fermi level.What is the probability that this state is occupied at a temperature of 9K? (m_el = 9.11 × 10^-31 kg,h = 6.626 × 10^-34 J • s,Boltzmann constant =

A) 1 × 10^-4
B) 2 × 10^-5
C) 5 × 10^-6
D) 1 × 10^-6
E) 2 × 10^-7