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Background Electrons give off light when they return to the ground state after being excited by an energy source
Bohr studies the light given 'Black Body' = heated body that gives off only the light from its internal glow - no reflected light
Spectral lines - Physics 2000 Black Box - St. Mary's H.S. Physics Online Atomic Spectra - (spectral lines) - St. Mary's H.S. Physics Online
Atomic Spectra - University of Oregon
Atomic Spectra for Iron
Full Spectrum
Hydrogen Emission/Absorption
Place your mouse over the image to
see the absorption spectra
Helium Emission/Absorption
Place your mouse over the image to see the absorption spectra Larger Version - Absorption / Emission Spectra Every Energy level
transition
Web version of "The Science of the Silicon Solar Cell" - Don Ion How many different spectral
lines can be produced by an atom
Answer 10 Spectral Lines Black Body Radiation Results:
1. Only the high energy objects gave off colors on the violet side of the spectrum
2. Electrons in atoms are not capable of giving off all colors (energies) 3. Each element gives off a unique pattern of colors called a 'bright line spectrum'.
This knowledge is very useful to chemists and other scientists. Why?
Answer 1. Spectral lines are used to:
To identify an unknown element - Electrify, Heat it up and analyze its colors. - Compare emitted colors to a database of elemental spectral lines
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