1. Waves

2. Characteristics of Waves

3. Frequency

4. Amplitude

5. Wavelength

6. Calculating wavelength and frequency  C = λv  C = speed of light 3x10 8 m/s  Λ = wavelength in meters  v = frequency in Hz  What is the wavelength of a microwave having a frequency of 3.44x10 9 Hz?

7. Practice  Do one on your own  Complete worksheet for homework

8. Electromagnetic Wave

10. What does the prism reveal about visible light?  Write your thoughts in your notebook

11. EM Spectrum

13. Visible Light

14. Refraction  Mediums refract light according to specific wavelength

15. Particle Nature of light

16. Quanta  Max Planck  Matter can gain or lose energy in small, specific amounts called QUANTA  E quantum = hv  E = energy  h = Planck’s constant 6.626x10 -34 JS  V = frequency

17. What does this mean  Energy is absorbed or released in discrete whole quanta 1hv, 2hv, 3hv 1hv, 2hv, 3hv  Cool but the wave model could not not explain the photoelectric effect

18. Photoelectric effect  Shine light at a metal and try to eject electrons

19. Photoelectric effect  No matter how long you shine lower energy light (lower frequency), electrons are not ejected  But even a dim light of a certain higher frequency does eject the electrons

20. E quantum = hv  E is energy (Joules)  h = Planck’s constant 6.626x10-34Js  v = frequency

21. Einstein  Proposed that light acts like a wave AND a particle.  Think of it as a stream of tiny particles  These particles are called photons  PHOTON = particle of electromagnetic radiation with no mass that carries a quantum of energy

22. Atomic Emission spectrum  Each element has a unique spectral signature