The Sun

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
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                                                           AST201H-­‐  Stars  and  Galaxies         Professor  Michael  Reid  
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