Assertion : A pure semiconductor has negative temperature coefficient of resistance. Reason : On raising the…
Assertion : A pure semiconductor has negative temperature coefficient of resistance.
Reason : On raising the temperature, more charge carriers are released, conductance increases and resistance decreases.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Solution
Semiconductor, any of a category of crystalline solids intermediate in electrical conductivity between a conductor and an insulator. Semiconductors are employed within the manufacture of varied forms of electronic devices, including diodes, transistors, and integrated circuits. Such devices have found wide application due to their compactness, reliability, power efficiency, and low cost.
As discrete components, they need found use in power devices, optical sensors, and light-weight emitters, including solid-state lasers.
When the temperature is raised, a number of the covalent bonds within the semiconductor break thanks to the thermal energy supplied.
The breaking of the bond set those electrons free which are engaged within the formation of those bonds.
In semiconductors, by increasing temperature, bond breaks and conduction holes and electrons increase.