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Lecture

Astronomy - Session 3

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Department
Astronomy
Course
ASTA02H3
Professor
Parandis Khavari
Semester
Winter

Description
Astronomy - Session 3  ➔ absorption of a photon  used as electricity to move into higher orbit  ➔ light > beam of particles with energy > photon  excited atom  ➔ emission of a photon  1. absorption of a photon with right energy  2. collision with other atoms  1. and 2. are methods to excite an atom  ➔ atoms are not always excited  absorbed photons will be emitted  produce emission line  cannot make energy  ➔ do you think an absorbed photon can be emitted as two photons?  what conditions must be satisfied?  ➔ signature emission/absorption line produced by each atom  why does each atom do that?  the phrase, "each atom" is equivalent to "different elements"  ex. why does Hydrogen and Helium make different radiation?  Professor's explanation:  each element has a unique construction  ex.  different level in orbits  ex.  Lyman series  from 1 to higher orbits  ultraviolet rays  orbits called n=x  Balmer series  ultraviolet rays are visible  n=2  Paschen series  IR  n=3  Q. why is Hydrogen so important in astronomy?  A. it was one of the first elements created in the Big Bang and is the most abundant  any element other than Hydrogen and Helium is called a "metal" in astronomy  high ultraviolet low IR  Q. why do Paschen
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