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Assertion (A) : The electrical conductiv...

Assertion (A) : The electrical conductivity of a semiconductor increases with increase in temperature.
Reason (R ) : With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

A

If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`

B

If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`

C

If `(A)` is correct, but `(R)` is incorrect.

D

If both `(A)` is incorrect, but `(R)` is correct.

Text Solution

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The correct Answer is:
A
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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

  • The electrical conductivity of intrinsic and p-type semiconductor increases with increase in

    A
    volume
    B
    density
    C
    pressure
    D
    temperature

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