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When an electric field is applied across...

When an electric field is applied across a semiconductor,

A

(a) electrons move from lower energy level to higher energy level in the conduction band.

B

(b) electrons move from higher energy level to lower energy level in the conduction band.

C

(c ) holes in the valence band move from higher energy level to lower energy level.

D

(d ) holes in the valence band move from lower energy level to higher energy level.

Text Solution

Verified by Experts

The correct Answer is:
A, C
Electrons take the energy and move up to neat higher energy level both in conduction and valance band. So, hole move downwards due to movement of electron.
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Knowledge Check

  • An electric field is applied across a semiconductor. Let n be the number of charge carries. As temperature increases, n will

    A
    increase
    B
    decrease
    C
    does not change
    D
    may increase or decrease

  • When electric field is applied inside a conductor then free electron are accelerated. Their average velocity in time interval t is proportional to

    A
    `t^(1)`
    B
    `t^(2)`
    C
    `sqrt(t)`
    D
    `t^(0 )`

  • Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented?

    A
    Reverse osmosis takes place
    B
    Electroosmosis takes place
    C
    Dispersion medium begins to move
    D
    Dispersion medium becomes stationary