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Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
Producing Light Waves
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Producing Light Waves

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  • 1. Producing Light Waves<br />Page 84<br />
  • 2. Terminology<br />Illuminated – You can see the object because of the light that bounces off of it (reflected light)<br /> Moon, planets, cars, people…<br />Luminous – The object creates light<br /> Sun, stars, burning wood, light bulb…<br />Spectroscope – Measure Light<br />84<br />
  • 3. Incandescent Lights<br />A light bulb with a filament inside that glows when hot<br />Invented by Thomas Edison 1879<br />84<br />
  • 4. Ordinary Light Bulbs<br />Thin wire = Tungsten<br />When hot glows white<br />To prevent burning sealed in glass<br /> Nitrogen and Argon<br />Less than 10% of energy used to make light<br />90% of energy makes heat (infrared rays)<br />85<br />
  • 5. Tungsten-Halogen Bulb<br />Thin wire = Tungsten<br />When hot glows white<br />To prevent burning sealed in glass<br /> Halogen gas<br />Burns much hotter therefore more light<br />Also means much more heat<br /> Severe fire danger<br />85<br />
  • 6. Fluorescent Lights<br />Glass tube filled with mercury vapor<br />Electricity causes gas to release ultraviolet rays<br />Powder lines the inside of the tube<br /> Powder hit with UV light then releases visible light<br />Advantage<br /> Most light created is visible light (more efficient)<br /> Do not get as hot as regular bulbs<br /> Lasts longer<br />86<br />
  • 7. Vapor Lights<br />Bulbs with neon/argon gas<br />Mixed with small about of solid sodium/mercury<br />Electricity is used to heat gas<br />Hot gas converts solid into gas which glows<br />Sodium solid = Yellowish light<br />Mercury solid = Bluish light<br />Often used as street lights/parking lots<br />No filament to burn out so long lasting and efficient<br />86<br />
  • 8. Neon Lights<br />Clear/colored glass tube<br />Fill with gas<br />Electricity causes gases to glow<br /> Neon = Red light<br /> Argon/mercury = Green/blue<br /> Helium = Pink<br /> Krypton = Violet<br />87<br />
  • 9. Wireless Communication<br />Radio/TV<br /> Two ways to send messages<br /> Amplitude Modulation (AM)<br /> Frequency Modulation (FM)<br />90<br />
  • 10. AM<br />Less energy<br />Bounce off atmosphere<br />Long range<br />Send messages in kHz<br />Range 535 – 1605<br />90<br />
  • 11. FM<br />High energy<br />Pass into space<br />Short range<br />Send messages in MHz<br />Range 88 – 108<br />90<br />
  • 12. TV<br />Very High Frequency (VHF)<br /> Range 54 – 216 MHz<br /> Channels 2 – 13<br />Ultra High Frequency (UHF)<br /> Range 470 – 806 MHz<br /> Channels 14 - 69<br />92<br />
  • 13. Cellular Phones<br />Use microwave frequencies<br />Requires a network of towers for signals<br />93<br />
  • 14. Communication Satellites<br />Spacecraft that orbit Earth<br />Receive and send messages to ground<br />94<br />
  • 15. Satellite Phone<br />Never out of range<br />Very expensive requires many orbiting satellites<br />94<br />
  • 16. Satellite Television<br />Distributes AM and FM signals to entire Earth<br />Small dish used to collect signals from space<br />Signals are often scramble to prevent theft<br /> Must buy descrambler to get image (box)<br />95<br />
  • 17. GPS<br />Global Positioning System<br />Satellites orbit at same speed as Earth turns<br /> Therefore can give exact location on Earth<br /> Use several satellites together for accuracy<br />Used by military initially<br />Now available in most new cars<br />96<br />
  • 18. Review<br />Illuminated vs luminous<br />Different Types of light bulbs<br />Incandescent<br />Fluorescent<br />Vapor<br />Neon<br />AM vs FM<br />Satellites<br />
  • 19. Quiz<br />
  • 20. Homework<br />Chose one type of light bulb and describe how it works. List at least one advantage of this type of light bulb.<br />

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