1. CHAPTER 5:Electrons in Atoms Light and Quantized Energy
The Wave Nature of Light
Light is a type of electromagnetic radiation.
Light is a particle that travels as a wave.
See p 137 for parts of a wave.

2. The Wave Nature Of light
Electromagnetic
radiation

3. Parts of a Wave
Wavelength is the length of a wave from one location to the same location in the next wave…crest to crest for example.
Amplitude is the vertical distance from origin to crest or origin to trough.
The trough is the ‘bottom-point’ of a wave and the crest is the ‘peak’ of a wave.
Frequency is how many waves per unit of time pass a point.
Period is how long it takes for a wavelength to pass a point.
F=1/period

4. Wavelength and Frequency
c = f • λ
where c=3.00x108 m/s λ=wavelength and f =frequency.

5. The Electromagnetic Spectrum

6. Electromagnetic Spectrum

7. Wavelength,Energy, and Frequency
Wavelength and frequency are inversely related…like on a see-saw.
E f λ

8. The Particle Nature of Light
A quantum is the amount of energy required to move an electron from one energy level to the next.
E=hf
…where E=energy and h=Planck’s constant h=6.626x10-34Js
This calculates the energy of a photon or quantum.

9. Atomic Emission Spectra

10. Absorption and Emission Spectra
Absorption spectra …Emission Spectra

11. 5.2 Quantum Theory and the Atom
Bohr’s model of the atom…