If E₀ and E_T are the average energies of the "free" electrons in a metal at 0 K and room temperature respectively, then the ratio E_T/E₀ is approximately: A)0 B)1 C)100 D)10⁶ E)infinity

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At 0 K, the average energy of "free" electrons in a metal is defined by the Fermi energy, and at room temperature, the average energy increases slightly due to thermal excitation. However, this increase is very small compared to the Fermi energy itself. Therefore, the ratio of the average energies at room temperature and at 0 K is very close to 1, indicating that the change in average energy due to temperature increase from 0 K to room temperature is negligible on the scale of the Fermi energy.

If E0 and ET Are the Average Energies of the "Free

If E₀ and E_T Are the Average Energies of the "Free