Giancoli 7th Edition textbook cover
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 19
Q
The energy gap between valence and conduction bands in germanium is 0.72 eV. What range of wavelengths can a photon have to excite an electron from the top of the valence band into the conduction band?
A
λ1.7  μm \lambda \leq 1.7 \; \mu \textrm{m}
Giancoli 7th Edition, Chapter 29, Problem 19 solution video poster
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