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For copper, N=8x 1022 atoms/cm3 and at normal temperatures the low frequency
conductivity is o-=5x 1017 sec"1. This gives yalfo- 3 x 1013 sec"1. Assuming that
f0 ~ 1, this shows that up to frequencies well beyond the microwave region ...
unit volume, is called the plasma frequency of the medium. The wave number is
given in the limit by ck = Vto2-wp2 (7.61) Sometimes (7.61) is expressed as a>2 =
a>p2 +c2k\ and is called a dispersion relation or equation for to = o)(k).
For the opposite limit of <o»<oc, the result is d2I dw dfl e-o VLy"«"*^ (14.88) 2ir C
o)c These limiting forms show that the spectrum at 0 = 0 increases with frequency
roughly as w2'3 well below the critical frequency, reaches a maximum in the ...
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Introduction and Survey
Introduction to Electrostatics
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