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Nature of light and atomic spectrum

Nature of light and atomic spectrum. Energy from the sun. Fusion – process of 2 nuclei that combine to make one (a new element ) and emitting large amounts of energy. The sun is a giant ball of hydrogen gas undergoing a fusion reaction – releasing energy.

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Nature of light and atomic spectrum

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  1. Nature of light and atomic spectrum

  2. Energy from the sun • Fusion – process of 2 nuclei that combine to make one (a new element ) and emitting large amounts of energy. • The sun is a giant ball of hydrogen gas undergoing a fusion reaction – releasing energy. • We know that energy as electromagnetic radiation

  3. Electromagnetic Spectrum

  4. Seeing color • White light contains all visible light spectrum • R O Y G B V • We see…. • Black – absorbing all colors • White – reflecting all colors • Color – ex: red – reflecting red and absorbing all other colors

  5. White Light • Example – sun light • Passes through prism & separates into continuous spectrum. • Called continuous because all portions are visible – no blank areas

  6. How is light formed? • All electrons in an atom exist naturally in their “ground state” e- configuration (all want to be close to nucleus – lower in energy) • If energy is added – electrons move to higher energy level – “excited state” – but don’t stay. • Electrons fall back to ground state and release light

  7. How is light formed? • An electron will jump to a higher energy level by absorbing energy. • An electron will fall back to ground state by releasing light • http://www.colorado.edu/physics/2000/quantumzone/bohr.html

  8. Atomic Emission Spectra • Element’s atomic emission spectra is unique - used to determine an unknown compound. • Like a fingerprint • All elements have a different atomic emission spectrum • Found by using a spectroscope.

  9. What is a spectroscope? • Instrument designed to visually observe spectra by splitting the LIGHT into its components. • Usually has PRISM or a DIFFRACTION GRATING to split light into components. • Diffraction gratings consist usually of thousands of narrow, closely spaced parallel slits (or grooves).

  10. White light passed through a prism

  11. One color of light passed through a prism

  12. Continuous Spectrum Emission Spectrum Absorption Spectrum

  13. continuous emission absorption

  14. Hydrogen spectrum The light of the gas is split into its components or an emission spectrum Helium spectrum

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