The difference in the variation of resistance | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) In metals,the number of free charge carriers (electrons) is essentially constant with temperature. As temperature increases,the scattering of elec

Vedclass · Accepted Answer

Variation of the number of charge carriers with temperature

Vedclass · Answer

(C) In metals,the number of free charge carriers (electrons) is essentially constant with temperature. As temperature increases,the scattering of electrons by lattice vibrations increases,leading to an increase in resistance.In semiconductors,the number of charge carriers (electrons and holes) increases exponentially with temperature due to the thermal excitation of electrons from the valence band to the conduction band. This increase in the number of charge carriers dominates over the scattering effect,causing the resistance to decrease as temperature increases.Therefore,the fundamental difference arises due to the variation of the number of charge carriers with temperature.

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

Similar Questions

The resistance of a conductor at $15^{\circ}C$ is $16\, \Omega$ and at $100^{\circ}C$ is $20\, \Omega$. What will be the temperature coefficient of resistance of the conductor?

Resistance of the wire is measured as $2\,\Omega$ and $3\,\Omega$ at $10^{\circ}C$ and $30^{\circ}C$ respectively. The temperature coefficient of resistance of the material of the wire is............$^{\circ}C^{-1}$.

$A$ negligibly small current is passed through a wire of length $15 \; m$ and uniform cross-section $6.0 \times 10^{-7} \; m^{2},$ and its resistance is measured to be $5.0 \; \Omega .$ What is the resistivity of the material at the temperature of the experiment?

If the resistance of a conductor is $5\,\Omega$ at $50\,^{\circ}\text{C}$ and $7\,\Omega$ at $100\,^{\circ}\text{C}$,then the mean temperature coefficient of resistance of the material is ............... $^{\circ}\text{C}^{-1}$.

In order to increase the resistance of a given wire of uniform cross-section to four times its value,a fraction of its length is stretched uniformly until the full length of the wire becomes $\frac{3}{2}$ times the original length. What is the value of this fraction?

Vedclass Test Series

Exam Paper Generator

Online Exam Module