1. The Electromagnetic Spectrum

2. The name given to a group of energy waves that are mostly invisible and can travel through empty space Shorter waves have more energy and longer waves have less energy longest wavelengthshortest wavelength

3. Characteristics of Radio waves: 1.Longest wavelength. 2. Transmit radio and TV signals. longest wavelengthshortest wavelength

4. Characteristics of Microwaves: 1.Shorter than radio waves. 2.Absorbed by water molecules. longest wavelengthshortest wavelength

5. Characteristics of Infrared waves: 1.Shorter wavelength than microwaves. 2.Felt as heat. 3.Hot objects give off infrared waves. longest wavelengthshortest wavelength

6. Characteristics of Visible light: 1.Shorter wavelength than infrared waves. 2.Can be seen as colors. 3.Half of Sun’s rays are visible light. longest wavelengthshortest wavelength

7. Characteristics of Ultraviolet light: 1.Shorter wavelength than visible light. 2.Give off harmful radiation. 3.Can kill living cells. 4.Causes skin cancer. longest wavelengthshortest wavelength

8. Characteristics of X-ray radiation: 1.Shorter wavelength than ultraviolet. 2.Give off harmful radiation. 3.Pass through skin, not bone. 4.Harmful to humans. longest wavelengthshortest wavelength

9. Characteristics of Gamma radiation: 1.Shortest wavelength (highest energy). 2.Comes from radioactivity or nuclear reactions. 3.Give off harmful radiation. 4.Harmful to humans. longest wavelengthshortest wavelength