Question

Assertion : In a metal all the free electrons have same energy.
Reason$\quad$: Electrons do not obey Pauli’s exclusion principle.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

Assertion is correct in the sense that the free electrons occupy a single energy band. But a band has a distribution of energy. One can treat assertion as correct. But the reason is false because electrons in a metal follow Pauli’s exclusion principle. It is because of this, one has different bands.