1. Electromagnetic Spectrum and Light Sara Persson November 8, 2010 Period 2

2. Electromagnetic Spectrum Electromagnetic Spectrum- The frequency range of electromagnetic waves.] Electromagnetic spectrum is just another way of referring to multiple types of radiation as a group.

3. Levels on the Electromagnetic Spectrum Radio: These waves are emitted not only through radio, but through stars and gases in space. Microwaves: Used by astronomers to know more about our galaxy, as well as nearby ones. Infared: This is what our skin emits. This is why we can be seen at night with night-vision goggles. Visible: This is what our eyes see. Visible radiation is emitted by fast-moving particles hitting other particles. Ultraviolet: Also called UV radiation. Stars and other “hot” objects in space emit Ultraviolet/UV rays. X-rays: Hot gases in the universe emit x-rays. X-rays are used to take a look at bones and teeth when you’re injured. Gamma-rays: Radioactive materials –whether natural, or produced by a power plant– can emit gamma-rays. The biggest gamma-ray generator is the universe itself.

4. Transparent, Translucent, & Opaque Transparent: See-through or clear; light can pass through it easily. – Ex: A normal window Translucent: Emits light; not as clear, or see- through as transparent. Not as easy to see shapes or figures through it. – Ex: A stained glass window Opaque: Reflects light. Nothing can be seen through it. – Ex: Wooden window shutters