1. Special

2. Light is a Wave (wavelength) Evidence Double slit experiment

3. The Speed of Light * c v - We should be able to see this effect using the motion of the Earth. For water waves the motion of an observer will “change” the speed of the waves: - * c + v

4. Michelson and Morley In 1887 Michelson and Morley did an experiment to detect the aether using the Earth’s motion relative to the aether

5. The experiment failed to detect any time difference for the two paths! Michelson and Morley

6. Relativity Light is an electromagnetic wave – there is no aether The speed of light is the same for any observer! Rest mass = energy Nothing can travel with light Nothing can reach v=c!

7. Space - Time A flash of light causes a spherical wave front even if you move relative to source This only makes sense if space and time mix! *