Question

Choose the correct answer:

1) At Zero degree Kelvin the Intrinsic Semiconductor has _______.
a) Only Free Electrons.
b) Only Free Holes.
c) Both (a) and (b).
d) No Free Carries.
-------------
2) At Zero degree Kelvin the Extrinsic Semiconductor has _______.
a) Only Free Electrons.
b) Only Free Holes.
c) Both (a) and (b).
d) No Free Carries.

-------------

3) Electrons or Holes can exist within the _______.

a) Conduction band.

b) Valence band.

c) Forbidden band.

d) Both (a) and (b).

-------------

4) When donor atoms are doped into an intrinsic Semiconductor, the Semiconductor becomes _______.

a) Extrinsic Semiconductor.

b) Compound Semiconductor.

c) n-type Semiconductor.

d) Both (a) and (c).

Answer 1

1) d)no free carriers

Resistance of a intrinsic semiconductor depends on the temperature. Higher the temperature more the electrons- holes pair will be generated , thus the resistance will be low at high temperature. Now at low temperature the resistance will increase. Now at zero kelvin no electrons- holes pair will be generated . Since there is no free charge carriers in the semiconductor, the semiconductor will not conduct when a voltage is applied across it.

2)C)both a and b

3)D) both a and b

4)C) n type semiconductors