# NEET Physics Semiconductor Electronics Questions Solved

If ${\mathrm{n}}_{\mathrm{e}}$ and ${\mathrm{n}}_{\mathrm{h}}$ are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then

(a) ${\mathrm{n}}_{\mathrm{e}}$>> ${\mathrm{n}}_{\mathrm{h}}$                (b)  ${\mathrm{n}}_{\mathrm{e}}$<< ${\mathrm{n}}_{\mathrm{h}}$
(c) ${\mathrm{n}}_{\mathrm{e}}$$\le$${\mathrm{n}}_{\mathrm{h}}$                  (d) ${\mathrm{n}}_{\mathrm{e}}$ = ${\mathrm{n}}_{\mathrm{h}}$

(a) Phosphorus is a pentavalent impurity so ${\mathrm{n}}_{\mathrm{e}}$>>${\mathrm{n}}_{\mathrm{h}}$ .

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