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LIGHT

LIGHT. What is Light?. What are some things that you know about light?. What is light?. Electromagnetic radiation Energy that travels in waves Ex. Radio waves, x-rays, light from a light bulb All EM Radiation travels at the speed of light 300,000 km/sec The c in E=mc 2.

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LIGHT

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  1. LIGHT

  2. What is Light? What are some things that you know about light?

  3. What is light? • Electromagnetic radiation • Energy that travels in waves • Ex. Radio waves, x-rays, light from a light bulb • All EM Radiation travels at the speed of light • 300,000 km/sec • The c in E=mc2

  4. What is Light? LONG SHORT p613

  5. The Spectroscope • An instrument used by astronomers to separate light (EM Radiation) into its separate parts. • It works by using prisms to split the visible light into it’s individual colors

  6. Types of Visible Spectra • Different objects give off 3 different types of spectra • Continuous Spectrum • Emission Spectrum • Absorption Spectrum

  7. Types of Visible Spectra Continuous Spectrum • an unbroken band of colors • Glowing solids • Glowing liquids • Hot, compressed gases

  8. Types of Visible Spectra Emission Spectrum • Unevenly spaced colored lines on a black background • Every element has its own emission spectra • It acts as a fingerprint each element

  9. Types of Visible Spectra Absorption Spectrum • A continuous spectrum with blacklines • Made when a light from a glowing object is passed through a cooler gas • The elements in the gas absorb the same light they would emit

  10. Types of Visible Spectra GLOWING SOLID HOT GAS (ELEMENT) GLOWING SOLID COOL GAS

  11. What does this have to do with stars?(DRAW THIS!) = An absorption spectrum COOLER GAS -absorbs light (emission spectrum) of the same element HOT CORE = hot compressed gas = continuous spectrum The lines that are “missing” are the elements in the atmosphere of the star

  12. ONE THING TO REMEMBER • Emission Spectrums are only observed in a laboratory • Absorption Spectrums are observed in real life (Example: stars)

  13. What is Light? R O Y G B V

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