# The conductivity of an extrinsic semiconductor with temperature

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The conductivity of an extrinsic semiconductor with temperature remains constant.

## Related questions

The electrical conductivity of a semiconductor increases with increase in temperature because (a) the carrier concentration increases (b) the mobility of carrier increases (c) both carrier concentration and mobility increase (d) the band gap decreases

When the temperature of a doped semiconductor is increased, its conductivity  (1) Decreases (2) Increases (3) Does not change (4) Increases or decreases depending on whether it is p-type or n-type

Define the term-Dopant, Extrinsic semiconductor.

The conductivity of a conductor can be increased by?

At absolute zero temperature, an intrinsic semiconductor behaves as (a) a good conductor (b) a super conductor (c) an insulator (d) variable resistor

Define intrinsic and extrinsic semiconductor.

Compare intrinsic and extrinsic semiconductor

At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because (A) Of drive in diffusion of dopants & carriers. (B) Band to band transition dominates impurity ionization. (C) Impurity ionization dominates band to band transition. (D) Band to band transition is balanced by impurity ionisation.

what is the temperature coefficient of Resistance of semiconductor ?

Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K: (1) 20 (2) 100 (3) 300 (4) 1.1

At transition temperature the value of the critical field is?

The transition temperature of mercury is?

The value of critical field below the transition temperature will?

The metal having the lowest temperature coefficient of resistance is

A semiconductor device made out of a material having very high temperature coefficient of resistance is

______ has zero temperature co-efficient of resistance.

State the temperature with standing capacity of following class-insulating material class Y, class A, class B, class E. Also state two examples for each.

The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple

With the increase in the temperature the resistance of copper: _____ and explain why? (1) Increase (3) Remain constant (2) Become zero (4) Decreases.

With rise in temperature the resistance of semi-conductors?

With rise in temperature the resistance of pure metals?

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is

The copper armature winding of a motor is subjected to an operating temperature of 80°C. The room temperature is 20° C. The percentage change in resistance of the armature winding from cold staring condition to normal running will be nearly:

The coils of D.C. motor starter are wound with wire of?

Explain types of impurity added in a semiconductor with one example each.

A resistor in which the resistance changes exponentially with change in temperature is called as A) Potentiometer B) Phototransistor C) Varactor D) Thermistor

An example of semiconductor of electricity is  A) Rubber B) Aluminium C) Plastic D) Silicon

In an n-type semiconductor, as the donor concentration ND increases, the Fermi level EF: (1) Remains unaltered (2) Moves towards the conduction band (3) Move towards the center of forbidden energy gap (4) May or may not move depending on temperature

In an intrinsic semiconductor the Fermi level is (a) closer to valence band. (b) closer to conduction band. (c) within the balance band. (d) midway between the valence and conduction bands.

Effect of increase in temperature in an overhead transmission line is (a) to increase stress and length both (b) to decrease stress and length both (c) to decrease stress and increase length (d) None of the above

At room temperature in an intrinsic piece of Si there could be (A) No free carriers (B) Some electrons but no holes (C) Some holes but no electrons (D) Equal number of holes and electrons