Giancoli's Physics: Principles with Applications, 7th Edition
29
Molecules and Solids
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29-1 to 29-3: Molecular Bonds
29-4: Molecular Spectra
29-5: Bonding in Solids
29-7: Band Theory of Solids
29-8: Semiconductors and Doping
29-9: Diodes
29-10: Transistors

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 23
Q

# Suppose that a silicon semiconductor is doped with phosphorus so that one silicon atom in $1.5 \times 10^6$ is replaced by a phosphorus atom. Assuming that the “extra” electron in every phosphorus atom is donated to the conduction band, by what factor is the density of conduction electrons increased? The density of silicon is $2330 \textrm{ kg/m}^3$, and the density of conduction electrons in pure silicon is about $10^{16} \textrm{ m}^{-3}$ at room temperature.

A
$3 \times 10^6$

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