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Statement 1: Conductivity of semiconduct...

Statement 1: Conductivity of semiconductor increases with increase in temperature.
Statement 2: Forbidden energy gap is highest for semiconductors.

A

Both statement-1 and statement-2 are true, and statement-2 is the correct explanation of statement 1.

B

Both statement-1 and statement-2 are true but statement-2 is not the correct explanation of statement-2

C

Statement-1 is true but statement-2 is false.

D

Statement-1 is false but statement-2 true.

Text Solution

Verified by Experts

The correct Answer is:
C
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The electrical conductivity of semiconductors ……. With increase of temperature.

Statement I : Electrical conductivity of semiconductors increases with rise in temperature. Statement II : There is a small energy gap between conduction band and valence band.

Knowledge Check

  • The conductivity of a semiconductor increases with increase in temperature because

    A
    (a) number density of free current carries increases
    B
    (b) relaxation time increases
    C
    both number density of carriers and relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density .
    D
    (d) number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increases in number density

  • The conductivity of a semiconductor increases with increase in temperature because

    A
    number density of free current carriers increases
    B
    relaxation time increases
    C
    both number density of carriers and relaxation time increase
    D
    number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

  • Statement 1: Conductivity of semiconductors decreases with increase in temperature Statement-2: More electron goes from valance band to conduction band with increase in temperature.

    A
    Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.
    B
    Both Statement-1 and Statement-2 are true but Statement-2 is not the correct explanation of Statement-1.
    C
    Statement-1 is true but Statement-2 is false.
    D
    Statement-1 is false but Statement-2 is true.

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    Forbidden energy gap in a semiconductor is

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