**Question:**

Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an $\mathrm{n}$-type semiconductor, the density of electrons is $10^{19} \mathrm{~m}^{-}$ ${ }^{3}$ and their mobility is $1.6 \mathrm{~m}^{2} /$ (V.s) then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to:

Correct Option: 3

JEE Main Previous Year 9 Jan. 2019I

**Solution:**