1. Particle Nature of Light page 49 of Notebook VISIBLE LIGHT ELECTRONS

2. Objective: To understand the duality of Particles/Waves To understand how light interacts with matter

3. What is The Particle Light Theory? In the particle light theory, waves exist as particles with wave like properties. The properties they have are frequencies, energy, and wavelengths.

4. The Wave model of light cannot explain: 1.Why heated objects only emit certain frequencies. 2.Why some metals emit electrons when light of a specific frequency shines on them.

5. What is the Quantum Concept? Matter can gain or lose energy only in small specific amounts called quanta. Explained why heated objects emitted certain frequencies/energy

6. What is a quantum? The minimum amount of energy that can be gained or lost by an atom.

7. What is Planck’s Constant? 6.626 x 10 -34 j. S Used to calculate the amount of energy in a quantum

8. What is the photoelectric effect? Electrons called photoelectrons are emitted from a metals surface when light of a certain frequency shines on it (Albert Einstein-1905)

9. What is a photon? A particle that has no mass and carries a quantum of energy

10. Calculations: Energy of a Photon E-energy h-planck’s constant V-frequency E photon = hv

11. Problem Solving Page 143 - Example Problem Class work – Page 143 Problem 5 Homework – Page 143 Problem 6 & 7

12. Bohr’s Model of the Atom Page 50 of Notebook

13. Quantum Model of the Atom Page 50 of Notebook