1. 1 Electromagnetic Spectrum “EMS”

2. Electromagnetic Spectrum Types of radiation that travel in waves 7 types of EM radiation (from lowest to highest frequencies) Radio Microwaves Infrared Visible Light Ultraviolet X-rays Gamma

3. Electromagnetic Spectrum Electromagnetic Spectrum

4. EMS High-frequency electromagnetic waves have a short wavelength and high energy Low-frequency waves have a long wavelength and low energy

5. Radio Waves RF refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by an alternating current fed to an antenna Emitted by radio stations, televisions, stars, submarines, avalanche beacons, heart monitors, & wireless LAN

6. Microwaves Microwaves have wavelengths approximately in the range of 30 cm to 1 mm Easily absorbed by water Used in radar, Bluetooth, and YES…your microwave oven!

8. Infrared The name literally means “below red” Used by military for night vision, target acquisition, & tracking Also used for short range wireless communication, & weather forecasting Associated with heat

9. Visible Light Visible Light (part of the spectrum you can see) Wavelengths range from 400 nm to 700 nm (4.00 x 10 -7 m to 7.00 x 10 -7 m) Longest wavelength = red Shortest wavelength = violet 1 nm = 1 x 10 -9 m

10. Ultraviolet Waves The name means “beyond violet” Used for tanning, treating psoriasis, & production of Vitamin D (UVB) Some animals (bees) can see UV rays Divided into three groups UVA – blacklight UVB – medium wave UVC – germicidal

11. X-rays A wavelength in the range of 10 to 0.01 nanometers Used for imaging bones, radiotherapy, & astronomy

12. Gamma Rays Produced from sub-atomic particle interaction Most are generated from nuclear reactions Wavelength ranges from 10 -11 m to 10 -14 m Used for finding cracks in metals, sterilization of medical equipment, CAT scans, & created The Incredible Hulk