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In 1802, william Wollaston discovered dark lines in the solar
spectrum. Those lines were studied afterwards by Joseph von Fraunhofer
who published a catalog of several hundred lines in 1814.
Scan the spectrum: how may lines can you count? ___________
Professional astronomers identified dozen of thousands lines in the
solar spectrum; Lhires Lite performance allows you to see couple of
thousands lines.
1.14.3 Experiment with spectral lamps
Look at a standard light bulb (do not use energy saving lamps).
Describe what you see: _______________________________
Can you see any lines? __________________________
Why? ____________________________________________
Than look at a energy saving lamp.
Describe what you see: ______________________________
Use a blank piece of paper (cut at the size of our scales) and draw
the spectrum you see. Compare to the reference spectrum scales:
sodium, neon, mercury...
What do you conclude on the gaz in an economy saving lamp?
________________________________________________
This experiment can be made with miscellaneous lamps including
laboratory lamps. Be of course very careful as some lamp can be
dangerous to watch visually (example: mercury lmaps emitting UV).
1.14.4 Sodium spectrum
Sodium (Na) is a chemical element you can find in lot of places. It is
for exemple a componant of the salt. With an adult and with lot of care
due to the fire risk (for exemple, watch out for your hairs!), experiment
by putting salt in the flame of a candle just upfront the flit of the Lhires
Lite. Look at the emission lines at the same position as the absorption
lines in the solar spectrum.
Lhires Lite – User Manual DC0005C
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