The average energies of the free electrons in a sample of a metal at 0 K and 60 K are E₀ and E₆₀, respectively. The ratio E₀/E₆₀ is

Correct option is A

Correct answer is A
Calculation:
At T = 0 K:
Average energy = Fermi energy (E0).
At T = 60 K:
Thermal effects cause a small increase in average energy (E60).
So, E0/E60 ⇒ slightly less than 1.