Choose the correct statement.

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

Question

(B) The correct statement is that when we heat a semiconductor, its resistance decreases.In semiconductors, the energy gap between the valence band an

Vedclass · Accepted Answer

When we heat a semiconductor, its resistance decreases.

Vedclass · Answer

(B) The correct statement is that when we heat a semiconductor, its resistance decreases.In semiconductors, the energy gap between the valence band and the conduction band is small.As the temperature increases, more electrons gain sufficient thermal energy to jump from the valence band to the conduction band.This increase in the number of charge carriers (electrons and holes) leads to an increase in conductivity.Since conductivity is the reciprocal of resistivity (and resistance), an increase in conductivity implies a decrease in resistance.

Similar Questions

What is the band gap energy for an insulator in $eV$?

Which graph shows correctly the temperature $(T)$ dependence of resistivity $(\varrho)$ of a semiconductor?

If $Cu$ (Copper) and $Ge$ (Germanium) are cooled to $70 \ K$,then:

The energy required for an electron to jump the forbidden band for germanium at room temperature is $........... eV$.

If the energy gap of a substance is $5.4 \ eV$,then the substance is

Vedclass Test Series

Exam Paper Generator

Online Exam Module