Electromagnetic Waves Waves that DO NOT require a medium to travel Can travel through a vacuum – empty space Waves that carry all types of light energy Creates the electromagnetic spectrum This is how we are able to get light and energy from the sun

Electromagnetic Spectrum Every type of light wave arrange by the frequency of each wave Lowest frequency to highest frequency Lowest amount of energy to highest amount of energy Include: Radio, Microwave, infrared, visible light, Ultraviolet, X-ray, Gamma

Electromagnetic Spectrum We get all sorts of our technology from the electromagnetic spectrum: Radio waves – Radio, TV, Satellites, radar, computer networks – lowest frequency – lowest amount of energy Microwaves – microwave ovens, cellphones, radars used to predict weather

Electromagnetic Spectrum Infrared – Remote controls, devices that detect heat Visible Light – only part we are able to see. Gives us vision and colors; Rainbows Ultraviolet Light – bug zappers, killing bacteria, black lights

Electromagnetic Spectrum X-Rays – used to see through skin, clothing, and other materials Gamma Rays – given off by stars; used to kill cancer, sterilize food and medical equipment, and used to make bombs; highest frequency so it has the highest amount of energy Click image for video