The electrical conductivities of Ge and Na ar | vedclass

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

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$\sigma_1$ increases and $\sigma_2$ decreases

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(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:

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