# Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is 1019 m – 3 and their mobility is 1.6m2 /(V.s) then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to:

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:

1. $2 \Omega \mathrm{m}$

2. $4 \Omega \mathrm{m}$

3. $0.4 \Omega \mathrm{m}$

4. $0.2 \Omega \mathrm{m}$

Correct Option: 3

JEE Main Previous Year 1 Question of JEE Main from Physics Semiconductor Electronics : Materials, Devices and Simple Circuits chapter.
JEE Main Previous Year 9 Jan. 2019I

Solution:

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