The New Encyclopaedia Britannica, Volume 24Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 353
... wavelengths 3 to 30 microns ; and far in- frared , with wavelengths 30 to 300 microns . Most of the radiation emitted by a moderately heated surface is infrared light ; it forms a con- tinuous spectrum . Molecular excitation also ...
... wavelengths 3 to 30 microns ; and far in- frared , with wavelengths 30 to 300 microns . Most of the radiation emitted by a moderately heated surface is infrared light ; it forms a con- tinuous spectrum . Molecular excitation also ...
Page 378
... wavelengths or frequencies . The re- sultant effect is a complex wave . A pulsating frequency , called beats ( q.v. ) , results when the wavelengths are slightly different . Figure 2 shows a complex wave ( solid line ) composed of two ...
... wavelengths or frequencies . The re- sultant effect is a complex wave . A pulsating frequency , called beats ( q.v. ) , results when the wavelengths are slightly different . Figure 2 shows a complex wave ( solid line ) composed of two ...
Page 396
... wavelengths , produc- ing dark absorption lines in the spectrum of starlight passing through . Larger particles of interstellar dust absorb light and scatter it . Blue light is scattered more than red , so that starlight coming from ...
... wavelengths , produc- ing dark absorption lines in the spectrum of starlight passing through . Larger particles of interstellar dust absorb light and scatter it . Blue light is scattered more than red , so that starlight coming from ...
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