Welcome to Physics is Phun Please take ONE

Welcome to Physics is Phun Please take ONE grating from trays by doors as you come in.

Please be Seated

The Atom Physics is Phun January 2008

The Elements by Tom Lehrer Animation by Flashimation Mike Stanfill, Private Hand 2330 Jonesboro, Dallas, TX 75228 214 -320 -2293 www. privatehand. com

The Electromagnetic Spectrum c=fl c = speed of light f = frequency l = wavelength

Duality of Light as Waves Light as particles – “photons”

Photons and the Photoelectric Effect E=hn E = photon energy h = Planck/s constant n = photon or light frequency

The Photoelectric Effect Water Boiling Water Photons Electrons in Metal Figure compliments of Kynningarvefur Eðlisfræðiskorar: http: //erik. raunvis. hi. is/nam/

Atomic Structure 1. Nucleus with 2. protons and neutrons 3. 2. Electrons surround nucleus 4. 3. Energy levels and the Periodic Table of Elements

Periodic Table of the Elements © 2000 Chem. Globe, periodictable@gmx. net

Atomic and Molecular Spectra 1. The Hydrogen Balmer series 2. Mercury vapor spectrum 3. Cadmium vapor spectrum 4. Sodium vapor spectrum 5. Molecular Iodine

Hydrogen Atomic Energy Levels

Sodium spectrum

Fraunhofer Spectrum

Atomic Phenomena 1. Fluorescence 2. 2. Phosphorescence 3. “delayed fluorescence”

Applications 1. Lasers 2. Neon signs 3. Fluorescent lights

Light Amplification by Stimulated Emission of Radiation

Helium-Neon Laser

He. Ne Laser Energy Level Diagram

He. Ne Laser and LED Spectra He. Ne Laser RYB Light-Emitting Diodes

The End See you in March! We are on the web at http: //www. physics. umd. edu/lecdem/ Animated Gifs compliments of bellsnwhistles. com