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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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Presentation Transcript
what is light
What is Light?

What are some things that you know about light?

what is light1
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
what is light2
What is Light?

LONG

SHORT

p613

the spectroscope
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
types of visible spectra
Types of Visible Spectra
  • Different objects give off 3 different types of spectra
    • Continuous Spectrum
    • Emission Spectrum
    • Absorption Spectrum
types of visible spectra1
Types of Visible Spectra

Continuous Spectrum

  • an unbroken band of colors
  • Glowing solids
  • Glowing liquids
  • Hot, compressed gases
types of visible spectra2
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
types of visible spectra3
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
types of visible spectra4
Types of Visible Spectra

GLOWING SOLID

HOT GAS (ELEMENT)

GLOWING SOLID

COOL GAS

what does this have to do with stars draw this
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

one thing to remember
ONE THING TO REMEMBER
  • Emission Spectrums are only observed in a laboratory
  • Absorption Spectrums are observed in real life (Example: stars)
what is light3
What is Light?

R O Y G B V

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