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Light and Electromagnetic Energy

Light and Electromagnetic Energy. The Particle-like nature of light. Light travels in “packets” called Photons. The Wave-like nature of light. Wavelength, l. c = l f. f = frequency, # per second (Hz) c= the speed of light, 300,000 km/s. The Electromagnetic Spectrum.

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Light and Electromagnetic Energy

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  1. Light and Electromagnetic Energy

  2. The Particle-like nature of light

  3. Light travels in “packets” calledPhotons

  4. The Wave-like nature of light

  5. Wavelength, l c =lf f = frequency, # per second (Hz) c= the speed of light, 300,000 km/s

  6. The Electromagnetic Spectrum

  7. 1 nm = 1 nanometer = 10-9 meters Microwaves Orange Blue Green Yellow violet Red

  8. Planck’s Law Energy of a photon = hc/l h = Planck’s constant c = speed of light l = wavelength

  9. Astronomical Instruments

  10. The main purposes of a Telescope: 1. Gather Light 2. Increase Resolution 3. Magnify the image

  11. Two main types of Optical Telescopes: Refracting - uses a lens to bend light Reflecting - uses a mirror

  12. Observatory Considerations

  13. Why not an observatory here?

  14. Accessibility/Weather

  15. Mauna Kea, Hawaii

  16. Keck twin 10 meter telescopes

  17. Mt. Palomar 200”

  18. Hubble Space Telescope

  19. Advantages: Above the atmosphere -> no “seeing” effects -> no absorption -> weather-proof -> it’s always nighttime!

  20. Radio Telescopes

  21. Green Bank , West Virginia

  22. Arecibo, Puerto Rico

  23. The Very Large Array, New Mexico Interferometry

  24. Radio Source Cygnus A

  25. The Center of our Galaxy

  26. Chandra X-ray Telescope

  27. M82 -Optical

  28. M82 - Radio

  29. M82 - Xray

  30. Astronomical Detectors - The Human Eye - Photographs (1840) - CCD’s (1980)

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