Light: What IS it?

Book says: ``Radiant Energy''





It's really an amazing thing!

Travels without any medium


Travels very fast     (``c'' = 300,000 km/s)

Moon to earth in ONE SECOND!

Earth to Sun ?

Outer Solar System ?





Comes in a variety of Flavors:

• Gamma-Rays
• X-Rays
• Ultra-violet
• Optical
• Infrared
• Radio