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Assertion: If there is some gap between ...

Assertion: If there is some gap between the conduction band and the valence band, electrons in the valence band all remain bound and no free electrons are available in the conduction band. Then the material is an insulator.
Reason: Resistance of insulators is very low

A

A is true, B is false

B

A is false, B is true

C

A and B are true

D

A and B are false

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • Find the wavelength of light that may excite an electron in the valence band of diamond to the conduction band. The energy gap is 5.50 eV

    A
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    B
    312 nm
    C
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    D
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  • Assertion : The electrons in the conduction band have higher energy than those in the valence band of a semiconductor Reason : The conduction band lies above the energy gap and valence band lies below the energy gap.

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

  • The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

    A
    increases exponentially with increasing band gap
    B
    decreases exponentially with increasing band gap
    C
    decreases with increasing temperature.
    D
    is independent of the temperature and band gap.

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