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Electromagnetic Radiation EMS SPECTRUM

Electromagnetic Radiation EMS SPECTRUM. What is light?. What we think of as light, is radiation, it is just part of the Electromagnetic Radiation Spectrum. Light travels as particles and as a wave. The speed of light is 299,792,458 m/s (670,616,629.384 mph)

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Electromagnetic Radiation EMS SPECTRUM

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  1. Electromagnetic RadiationEMS SPECTRUM

  2. What is light? • What we think of as light, is radiation, it is just part of the Electromagnetic Radiation Spectrum. • Light travels as particles and as a wave. • The speed of light is 299,792,458 m/s (670,616,629.384 mph) • The speed of sound is about 770 mph at standard temperature and pressure

  3. What is color • Color is just different wavelengths of Electromagnetic radiation • All of the colors of the rainbow are hidden in “normal” light that comes from the sun. • They can be separated, so that we can see them, using a prism.

  4. What’s in the Electromagnetic Spectrum?

  5. Let’s go from big to small • Radio Waves • Radio waves have the longest wavelengths in the electromagnetic spectrum. • These waves can be longer than a football field or as short as a football. • Your radio, cell phone, and walkie talkie use radio waves. • Can radio waves pass through mountains, Buildings, tunnels?

  6. Microwaves • Microwaves have wavelengths that can be measured in centimeters! • The longer microwaves, those closer to a foot in length, are the waves which heat our food in a microwave oven. • Microwaves are good for transmitting information from one place to another because microwave energy can penetrate haze, light rain and snow, clouds, and smoke. • Microwaves, used for radar, are just a few inches long.

  7. What is Radar? • RADAR (Radio Detection And Ranging) is a way to detect and study far off targets by transmitting a radio pulse in the direction of the target and observing the reflection of the wave. • It’s basically radio echo

  8. RADARRAdio Detection And Ranging Antenna Propagation Target Cross Section Reflected Pulse (“echo”) Transmitted Pulse • Radar observables: • Target range • Target angles (azimuth & elevation) • Target size (radar cross section) • Target speed (Doppler) • Target features (imaging)

  9. Radar Frequencies

  10. Types and Uses of Radar • Weather radars use radio waves with horizontal, dual (horizontal and vertical), or circular polarization • Some weather radars use the Doppler effect to measure wind speeds

  11. Infrared • Infrared light lies between the visible and microwave portions of the electromagnetic spectrum. • The longer infrared wavelengths are about the size of a pin head and the shorter infrared ones are the size of cells. • Most remotes use infrared lights. • Many organisms can see infrared light. • Many night vision goggles use infrared radiation.

  12. Visible Light Waves • Visible light waves are the only electromagnetic waves we can see. • We see these waves as the colors of the rainbow, red, orange yellow, green, blue, indigo, and violet. ROY G BIV • Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. • When all the waves are seen together, they make white light.

  13. What is Black light? • It’s part of the electromagnetic spectrum near Ultra Violet light.

  14. Ultra Violet Light • Ultraviolet (UV) light has shorter wavelengths than visible light. • Though these waves are invisible to the human eye. • Some insects, like bumblebees, can see them!

  15. X-RAY • As the wavelengths of light decrease, they increase in energy. • X-rays have smaller wavelengths and therefore higher energy than ultraviolet waves. • We usually talk about X-rays in terms of their energy rather than wavelength. • X-ray light tends to act more like a particle than a wave. • X-ray detectors collect actual photons of X-ray light!

  16. Gamma-rays • Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. • These waves are generated by radioactive atoms and in nuclear explosions. • Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells.

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