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Electronic Devices question

2002 · Shift 0 · Q136
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Electronic Devices question

2002 · Shift 0 · Q136

JEE MainPhysicsElectronic DevicesMCQ+4 / −1
At absolute zero, Si acts as
  1. A
    non-metal
  2. B
    metal
  3. C
    insulator
  4. D
    none of these
View written solutionFree

Correct answer: C

  1. Nature of silicon at ordinary temperature

    Silicon (Si) is a semiconductor. Its electrical conductivity lies between that of a conductor and an insulator.

  2. What happens at absolute zero?

    At T=0 KT=0\,\text{K}T=0K, there is no thermal energy available to excite electrons from the valence band to the conduction band.

  3. Band picture

    • The valence band is completely filled.
    • The conduction band is empty.
    • Therefore, there are no free charge carriers available for conduction.

  4. Conclusion about conductivity

    Since no electrons are available in the conduction band at absolute zero, silicon cannot conduct electricity.

    Hence, at absolute zero, Si behaves as an insulator.

  5. Option check

    • A: non-metal — This is a chemical classification, not the correct electrical behavior asked here.
    • B: metal — Incorrect, metals conduct even at very low temperature.
    • C: insulator — Correct.
    • D: none of these — Incorrect.

Therefore, the correct answer is:

C: insulator\boxed{\text{C: insulator}}C: insulator​

  1. Comparison with stored answer

    Stored correct answer = C

    Derived answer = C

    So, they agree.

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