A Short University Course in Electricity Sound And Light
The book A Short University Course in Electricity Sound And Light was written by author Robert Andrews Millikan Here you can read free online of A Short University Course in Electricity Sound And Light book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Short University Course in Electricity Sound And Light a good or bad book?
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When, however, a gas or vapor is brought to incandescence, its pure spectrum is found to consist of a number of separate images of the slit, each, of course, in its own color. This means that an incandescent gas or vapor emits only radiations of certain definite DISPERSION AND SPECTRA 307 wave lengths. Spectra of this type are called bright-line spectra. They are produced by vaporizing metallic salts in a hot flame, like that of the Bunsen burner, or by sending electrical discharges through tub...es containing, in rarefied form, the gases to be ex- amined. The characteristic spectrum of sodium, for example, is usually formed by placing common salt or some other compound containing sodium, for example an ordinary glass rod, in a Bunsen flame. It consists of two bright yellow lines very close together. In ordinary spectroscopic work it is seen simply as a single line, but if the slit of the spectrometer is made exceedingly narrow, the original broad image of a broad slit is found to separate into two narrow images of the very narrow slit, thus showing that the images were not originally distinguished as two merely because they overlapped.
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