Unformatted text preview: As indicated earlier, white light contains a continuous spectrum including all the visible wavelengths of
light. Interestingly, if one uses a spectroscope to look at sunlight (not directly at the sun, which v
cause damage to your eyesight!!, but indirectly by pointing the spectroscope at a clear part of the
we observe numerous dark lines superimposed on the continuous spectrum. This phenomenon was
originally observed by Wollaton in 1802 and then again later by Fraunhofer in 1817. Called Frau it
lines, these lines correlate with the line spectra of various elements that are thought to exist in the outer
atmosphere of the sun (Figure 7).
Figure 7 Fraunhofer lines.
a. Explain the process by which these dark lines are generated by the elements in the sun's atmosphere.
Specifically, why are they black and not colored, and why do they match the colored line spectra of
These lines are black & not colored because of different elements
like helium &hydrogen, which are both found in the jun's
b. Compare the Fraunhofer lines to the line spectra in Figure 6. Which of these elements are in the sun?
Hydrogen ? Helium
ased on your experience in this lab, draw a connection to something in your everyday life or the world around
u (something not mentioned in the background section).
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- Spring '18