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Solar Spectrum |
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The solar spectrum appears to be continuous spectrum on causal inception. However, critical examination shows that it is a dark-line continuous spectrum
i.e. continuous spectrum with a large number of dark lines. These lines were discover by Fraunhofer and are, therefore, called Fraunhofer
lines. These lines are produced to the absorption of light of certain Wavelength by the solar atmosphere. |
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When a number of charges are present, the total force on a given charge is equal to the vector sum of forces due to the remaining other charges
on the given charge. |
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See the fig. it is called photosphere. Around the photosphere
is gases and metallic vapors at comparatively lower temperature.
When white light from the photosphere passes through these
vapors,
they would emit if heated to incandescence. |
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Thus if sodium, iron and copper are presented in the sun, the
vapors of these element will be present in its atmosphere.
The light passing through the sun's atmosphere containing these
vapors will lose those wavelength (or colors) which
sodium, iron and copper emit when luminous. |
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These wavelength, will therefore be missing when solar spectrum is examined. The dark lines in the solar spectrums
represent the missing wavelengths. The missing wavelengths correspond to definite elements which compose to sun by
this method before it was found on earth. Note that the solar spectrum is example of line absorption spectrum.
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