Fraunhofer Lines
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-484
2025-12-21
28
The dark lines described above are called the Fraunhofer lines, and on account of their invariable position are used as standards of wave length. A careful comparison of the position of these lines with the bright line spectra of iron, copper, silver, zinc, sodium, and many other elements shows that they have exactly the same wave lengths, and hence it is concluded that these elements exist in the atmosphere of the sun in a state of vapor. The positions of the most prominent of the Fraunhofer lines are shown in Fig. 1, in which the violet end of the spectrum is at the right.
in the atmosphere of the sun in a state of vapor. The positions of the most prominent of the Fraunhofer lines are shown in Fig. 1, in which the violet end of the spectrum is at the right.
The above table gives the wave lengths of some of the dark lines of the spectrum. There are parts of the visible spectrum in the red end that have longer wave lengths than the A line, as well as parts in the violet that have shorter wave lengths than the H line.
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