An intrinsic semi conductor has 10¹⁸/m³ free electron and is doped with pentavalent impurity of 10²⁴/m³. Then the free electrons density order increase by

Given,

There are extra electrons in the pentavalent substance. The difference between their individual electron densities rises when they are doped with an additional intrinsic semiconductor possessing some electron density. Electric current flows as a result of these liberated electrons.

The intrinsic semiconductor has a free electron density of ${10}^{18}/m^3$. The density order of the free electrons increases by $24-18=6$ when it is doped with a pentavalent impurity with a density of ${10}^{24}/m^3$. This is because the free electrons.