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Midterm

Light - Midterm 2.docx

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Department
Astronomy
Course
CAS AS 101
Professor
Paul Withers
Semester
Fall

Description
AS 101 LIGHT LECTURE CONTINUED: FRIDAY 10- 11-13 1 Learning from Light: • Electrical Potential Energies in atoms are quantitized. • Only certain values are allowed • The set of permitted values is different for each atom­ like a fingerprint. Gravitational PE = MGH • Electrons are usually in low energy areas • Electrons fall from state of high electrical PE  ▯to low EPE. • When electrons fall – they emit photons of light. Absorption Spectrum Vs. Emission Spectrum: An emission spectrum indicates the frequencies of emitted photons as electrons  within the atoms return to their 'ground' states, an absorption spectrum record the  absorption of electromagnetic radiation ­ as photons of specific energies, that p
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