sigma_1 and sigma_2 are the electrical conduc | vedclass

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(B) $Ge$ (Germanium) is a semiconductor,and $Na$ (Sodium) is a metal.For semiconductors,the number of charge carriers increases significantly with an

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$\sigma_1$ increases and $\sigma_2$ decreases

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(B) $Ge$ (Germanium) is a semiconductor,and $Na$ (Sodium) is a metal.For semiconductors,the number of charge carriers increases significantly with an increase in temperature,leading to an increase in electrical conductivity ($\sigma_1$ increases).For metals,the increase in temperature leads to increased lattice vibrations (collisions),which increases the resistivity and consequently decreases the electrical conductivity ($\sigma_2$ decreases).Therefore,$\sigma_1$ increases and $\sigma_2$ decreases.

$\sigma_1$ and $\sigma_2$ are the electrical conductivities of $Ge$ and $Na$ respectively. If these substances are heated,then

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