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Question: Answered & Verified by Expert
Assertion : In a metal all the free electrons have same energy.
Reason : Electrons do not obey Pauli's exclusion principle.
PhysicsNuclear PhysicsAIIMSAIIMS 2007
Options:
  • 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.
Solution:
1718 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false
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.

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