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Forbidden City 224 The width of the forbidden band of a particular material can
be measured by noting the change in electric properties as it is illuminated by
diflerent wavelengths of light. The wavelength of light indicates the precise
energy of ...
He plotted 576 of them and denoted the principle ones by the letters A through C.
By measuring their wavelengths he found that their relative positions in the
spectra of the elements are constant, whether the spectra is produced by the
7:828g -radio emissions and hydrogen content 15:474c galaxy, Seyfert, one of a
class comprising about 2 percent of spiral galaxies, characterized by intensely
bright central nuclei and strong radiation at radio and infrared wavelengths.
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review