The reflection, refraction, and speed of sound waves are explained. A discussion of forced vibrations and resonance culminates with exciting historical footage of the collapse of the Tacoma Narrows Bridge in 1940. The electromagnetic nature of light and the reason its speed changes when passing through transparent materials are explained. Several demonstrations illustrate the addition of different colors of light. Finally, the colors of everyday things such as the sky, sunset, and ocean are discussed.
Refraction is demonstrated using a water tank.
The concepts of total internal reflection and light dispersion are discussed, leading to a demonstration of properties of a rainbow. The interference of light waves is demonstrated with laser light, and related to the colors of thin films. A discussion on polarization is illustrated using polarizing material. Lightning rods, charging by induction, and charge polarization are also discussed. Concepts in electric current and examples of Ohm's law are discussed.