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.

$LIST$ $I$	$LIST$ $II$
$A$. Intrinsic Semiconductor	$I$. Fermi-level near conduction band
$B$. $n$-type semiconductor	$II$. Fermi-level at middle
$C$. $p$-type semiconductor	$III$. Fermi-level near valence band
$D$. Metals	$IV$. Fermi-level inside conduction band

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

Similar Questions

In which material is the energy band gap maximum?

In semiconductors at room temperature,

The forbidden energy gap for $Ge$ crystal at $0 \,K$ is (in $\,eV$)

In the energy band diagram of insulators,the band gap and the conduction band are respectively:

Vedclass Test Series

Exam Paper Generator

Online Exam Module