nature of line radiation
Need to understand why lines are fingerprints
- same lines from our tubes (H, He, Ne, Hg) seen in
- Aurorae on Earth and Jupiter
- chromosphere and corona of Sun
- galactic nebulae
- for example the Orion Nebula in Orion’s sword
- Electromagnetic radiation (i.e. light) emitted whenever charges are accelerated
- H. Hertz proved this ~ 1880
- because of Newtons laws (F = ma and F12 = -F21) electrons do most of the radiating
- proton mass 1800 times electron mass
- e.g. Prof. and skateboard -- the skateboard accelerated most
- Examples
- electron traveling in straight line at constant velocity
- no acceleration, no radiation