Electromagnetic radiation waves Waves are three dimensional Waves vibrate in all planes around a center line. The waves have high points called “crests.” Waves also have low points called “troughs.” *The distance from one crest to the next crest is called a “wavelength.” *The number of waves passing a given point in one second is called the “frequency.” wavelength

Remember radio waves are long…and gamma rays are small Radio-TV -Microwave- Infrared - VISIBLE -Ultraviolet -X-rays - Gamma- Cosmic

Radio (Longest electromagnetic waves) Emitted by Astronomical Objects Radio Station Transmitters Detected by Ground based radio telescopes *If you turn on a radio, it will convert the radio wave energy into sound energy.

Microwave Emitted by: Detected by Gas clouds collapsing into stars Microwave Ovens Radar Stations Cell Phones Detected by Microwave Telescopes Food (heated) Cell phones Radar (systems)

Infrared (Heat or Thermal) Are you a source of infrared? YES you are! Emitted by Sun and stars (Near) TV Remote Controls Food Warming Lights (Thermal) *Everything at room temperature or above,=HEAT Detected by Infrared Cameras TVs, VCRs, Your skin

Visible Each color is a different size wave Visible Each color is a different size wave. Red the longest & violet the shortest Emitted by The sun and other astronomical objects Laser pointers Light bulbs Detected by Cameras (film or digital) Human eyes Plants (red light) Telescopes RoyG.Biv

Ultraviolet Sunburn / black light He can get skin cancer! Emitted by Tanning booths (A) The sun (A) Black light bulbs (B) UV lamps Detected by Space based UV detectors UV Cameras Flying insects (flies)

X-ray Emitted by Detected by Astronomical objects X-ray machines CAT scan machines Older televisions Radioactive minerals Airport luggage scanners Detected by Space based X-ray detectors X-ray film CCD detectors

Gamma Ray (Short electromagnetic waves but more energetic) Emitted by Radioactive materials Exploding nuclear weapons Gamma-ray bursts Solar flares Detected by --Geiger counters Gamma detectors and astronomical satellites Medical imaging detectors

How big are the waves? A great question! Radio waves= (Buildings to human size); Microwaves (Humans-beetles); Infrared waves (Eye of a needle); Visible waves (microscopic size)! WOW! All the rest are the size of molecules, atoms, atomic nuclei and smaller..