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Radiation – Electromagnetic Energy

Radiation – Electromagnetic Energy. PHY 299 Spring 2009 Bob Brecha. Light Waves. Light is a form of wave, like a water wave or a wave on a rope. But ... waves need something to “wave” ( e.g. water or rope or a crowd ) Light (electromagnetic) waves can also move through vacuum.

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Radiation – Electromagnetic Energy

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  1. Radiation – Electromagnetic Energy PHY 299 Spring 2009 Bob Brecha

  2. Light Waves Light is a form of wave, like a water wave or a wave on a rope. But ... waves need something to “wave” (e.g. water or rope or a crowd) Light (electromagnetic) waves can also move through vacuum.

  3. What are Light Waves ? Light waves are really made up of electric fields and magnetic fields - more on that later Moving electric charges are the source for all electromagnetic waves.

  4. What are Waves ?

  5. What are Waves?

  6. Wave Properties The period of a wave is related to the wavelength of the wave. It is sometimes easier to talk about the “frequency” of the wave rather than the period f = 1/T c = f × l c = speed of light (300,000 km/sec.)

  7. Blackbody Radiation

  8. Blackbody Radiation Low temperatures Long wavelength radiation 40ºC  10,000 nm peak (10 mm) High temperatures  Shorter wavelength radiation 6000 ºC  500 nm peak (0.5 mm)

  9. Blackbody Radiation

  10. Blackbody Radiation

  11. Greenhouse Effect

  12. Greenhouse Effect

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