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: –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. 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

Ultraviolet Sunburn / black light 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 –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

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..