Physics for Scientists and Engineers, Vol. 1
Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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Chapter 38, Problem 40P
To determine

The maximum photon wavelength that will excite the electron into the conduction band.

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The gap between valence and conduction bands in silicon is 1.12 eV. A nickel nucleus in an excited state emits a gamma-ray photon with wavelength 9.31 * 10-4 nm. How many electrons can be excited from the top of the valence band to the bottom of the conduction band by the absorption of this gamma ray?
The mean speed of conduction electron in Cu is electrons1.5 × 106 ms-1 and the frequency of vibration of the copper atoms at room temperature is about 4 × 1012 s-1. Estimate the drift mobility of electrons and the conductivity of Cu. The density of Cu is 8.96 g cm-3 and the atomic mass is 63.56 g mol-1.
K: Estimate the ratio of the electron densities in the conduction bands of silicon (Eg 1.14 eV) and gallium arsenide (Eg = 1.42 eV) at 400 K.
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