*Electromagnetic Radiation Electromagnetic radiation can be described in terms of a stream of photons. Each photon is traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy. The only difference amongst radio waves, visible light, and gamma-rays is the amount of energy of the photons. Radio waves have photons with low energies. Microwaves have a little more energy than radio waves. Infrared has still more energy. As we move down the chart we see visible, ultraviolet, X-rays, and gamma-rays whose photon energies gradually increase. Gamma and Cosmic rays have the highest energy waves.

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.

Television Shorter than radio, also used to carry messages (pictures & sound) to our TV sets. *We can sense the TV waves around us with our televisions.

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

Prism Power: Roy G. Biv *What happens when light shines through prisms?

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

Sources of Gamma-ray Emission • Black holes • Active Galaxies • Pulsars • Diffuse emission • Supernova Gamma-ray bursts • Unidentified

COSMIC Rays (The highest energy waves and the deadliest) Cosmic rays come from deep space and can pass through the Earth.

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..