The electrical conductivities of Ge and Na ar | vedclass

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

Question

(D) $Ge$ (Germanium) is a semiconductor. When a semiconductor is heated,the number of charge carriers (electrons and holes) increases due to the break

Vedclass · Accepted Answer

$\sigma_1$ increases and $\sigma_2$ decreases

Vedclass · Answer

(D) $Ge$ (Germanium) is a semiconductor. When a semiconductor is heated,the number of charge carriers (electrons and holes) increases due to the breaking of covalent bonds,which leads to an increase in its electrical conductivity $\sigma_1$.$Na$ (Sodium) is a metal (conductor). When a metal is heated,the amplitude of vibration of the lattice ions increases,which leads to more frequent collisions with electrons. This increases the resistance of the metal,thereby decreasing its electrical conductivity $\sigma_2$.Therefore,$\sigma_1$ increases and $\sigma_2$ decreases.

The electrical conductivities of $Ge$ and $Na$ are $\sigma_1$ and $\sigma_2$ respectively. If these materials are heated,then:

Similar Questions

The energy gaps $(E_g)$ between the valence band and conduction band for diamond, silicon, and germanium are in the order:

Carbon, silicon, and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$, $(E_g)_{Si}$, and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?

$A$ piece of copper and another of germanium are cooled from room temperature to $80\, K$. Which of the following is a correct statement?

Choose the correct statement.

The band gap in Germanium and Silicon in $eV$ respectively is

Vedclass Test Series

Exam Paper Generator

Online Exam Module