1. Electrons and the Electromagnetic Spectrum

2. Electromagnetic Radiation: energy that exhibits wavelike behavior and travels at the same speed Properties of Light

3. **remember, all of these waves travel at the same speed…the speed of light!

4. Continuous and Line Spectra light Na H Ca Hg 400 450 500 550 600 650 700 750 nm Visible spectrum  (nm)

5. Atoms emit energy on the EMR spectrum when their electrons relax to a ground state. We can calculate this energy, wavelength and frequency!!!! Atoms and EMR

6. Wavelength ( λ ) is the distance between wave peaks Frequency ( ν ) is the number of waves that pass in a second Frequency and wavelength are inversely proportional Properties of light, con’t

7. Wavelength and Frequency

8. Frequency and wavelength are mathematically related to each other: c = λν c = is the speed of light = 3.0 x 10 8 m/s λ = is the wavelength (in m) ν= is the frequency (in s −1 ).

9. **Remember c is a constant = 3.0 x 10 8 m/s 1. A wave has a frequency of 2 x 10 12 Hz. What is the wavelength? Practice using the equation c = λν

10. 2. A certain microwave has a wavelength of 0.032 meters. Calculate the frequency of this microwave. Practice

11. A Quantum of energy is the minimum energy that can be lost or gained by an atom. E= h v E = energy in Joules h= planks constant, 6.626 x 10 -34 J s v= frenquency Quantum Energy!

12. 1.Determine the energy of a photon whose frequency is 3.55 x 10 17 Hz. Practice

13. 1. Determine the energy of a photon who’s frequency is 6.7 x 10 3 Hz 2. A radio wave has a frequency of 250,000 Hz. What is the wavelength of this radiowave? Mixed practice, determining which equation to use..