Q28. For insulators and semiconductors, the resistance decreases with increase in temperature becaus

Q: What is the correct answer for CUET UG Physics Q28?

The correct answer is B. In insulators and semiconductors, charge carriers (electrons and holes) are predominantly generated by thermal energy. As the temperature of these materials increases, more valence electrons gain sufficient energy to break away from their atomic bonds and become free charge carriers (or to jump into the conduction band). This phenomenon leads to a significant increase in the number density of avai

Q: Q28. For insulators and semiconductors, the resistance decreases with increase in temperature because (a) number density decreases (b) number density of charge carriers increases (c) Resistivity does…

The correct answer is B. In insulators and semiconductors, charge carriers (electrons and holes) are predominantly generated by thermal energy. As the temperature of these materials increases, more valence electrons gain sufficient energy to break away from their atomic bonds and become free charge carriers (or to jump into the conduction band). This phenomenon leads to a significant increase in the number density of avai

Q: What are the options for this CUET UG Physics question?

A. number density decreases · B. number density of charge carriers increases · C. Resistivity does not depend upon the temperature · D. Resistivity does not depend upon the number density of Charge carriers

Question

Q28. For insulators and semiconductors, the resistance decreases with increase in temperature because
(a) number density decreases
(b) number density of charge carriers increases
(c) Resistivity does not depend upon the temperature
(d) Resistivity does not depend upon the number density of Charge carriers

FirstInTest · Accepted Answer

In insulators and semiconductors, charge carriers (electrons and holes) are predominantly generated by thermal energy. As the temperature of these materials increases, more valence electrons gain sufficient energy to break away from their atomic bonds and become free charge carriers (or to jump into the conduction band). This phenomenon leads to a significant increase in the number density of available charge carriers. Since electrical conductivity is directly proportional to the number density of charge carriers and resistance/resistivity is inversely proportional to conductivity, an increase in carrier density results in a decrease in the material's resistance and resistivity. This effect is in contrast to metals, where resistivity generally increases with temperature due to increased electron scattering.

Answer

number density decreases

Answer

number density of charge carriers increases

Answer

Resistivity does not depend upon the temperature

Answer

Resistivity does not depend upon the number density of Charge carriers

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