6 Electromagnetic Radiation The sun is so powerful that it creates 7 different kinds of radiation.Some of this radiation is strong (waves close together); some of it isweak (waves far apart).All the different kinds of radiation is organized in an Electromagnetic Spectrum.
7 Electromagnetic Spectrum There are 7 kinds of radiation in the electromagnetic spectrum:Radiowaves, Microwaves, Infrared Radiation, Visible Light, Ultraviolet Radiation, X-Rays, and Gamma Rays.
8 The Electromagnetic Spectrum Radiowaves – weak waves that give your radio or TV the energy to work. (can you see them?)Microwaves - weak waves that can cook your food or used for cell phones and radar. (can you see them?)Infrared Radiation – weak waves coming from something that is hot. (can you see them?)Visible Light – the only radiation you can see.
9 Continued…Ultraviolet Radiation – strong radiation that can make you tan and get cancer. (Can you see them?)X-Rays – dangerous radiation that can go through to your bones. (can you see them?)Gamma rays - the most powerful radiation. Very dangerous. Found in a nuclear explosion.
10 Visible Light Humans can only see visible light. Visible light is made up of all of the colors of the rainbow:RedOrangeYellowGreenBlueIndigoViolet
11 How visible light travels… Visible Light travels in waves…BUT, the waves are so small that from far away it looks like a straight line.SO…from now on we will ONLY say that light travels in a straight line.
12 Does light travel in a straight line FOREVER? Light travels in a straight line ONLY if travels through the same medium (like air or water).Otherwise…if light strikes an object, then it changes direction and is not straight anymore.
13 Light Does 4 Things When it Hits an Object: ReflectionTransmittanceAbsorptionRefraction
14 4 things can happen when light hits an object: ReflectionAbsorptionTransmissionRefraction