The Sun

48 views4 pages
Published on 20 Apr 2013
School
UTSG
Department
Astronomy & Astrophysics
Course
AST201H1
Professor
AST201H()Stars)and)Galaxies))) )
Professor)Michael)Reid))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))Lecture)Notes))
January)24,)2013)
Lecture'6:'Light'and'Matter'
Light''
Higher)frequency)=)higher)energy)
Solar)spectrum)–)rainbow)color)–)color)particles)are)not)connected)
Atoms''
Electron)Orbits)
o Electron)can)only)orbit)at)a)certain)fixed)distances)from)nucleus)'
o It)orbits)a)certain)orbital)path)and)cannot)move)around'
o Orbits)are)quantized)according)to)Bohr'
Electron)in)different)orbits)have)different)levels)of)energy)'
o Atom)emits)or)absorbs)light)only)when)electrons)change)orbits'
! It)HAS)TO)BE)a)certain)frequency)in)order)to)change)the)energy)
level)of)the)atoms)'
! Shorter'the'distance'between'orbits'require'lower'energy'
(lower'frequency)'to'change'the'energy'level'–'vice'versa''
o Emission)–)get)rid)of)the)light)that)has)been)absorbed)'
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