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PLANET EARTH. LIGHT. Lab Experiments. Distance Behavior - I = A/r 2 +B Definition of color - The ratio of two colors at the same distance. Color and Temperature - objects get more “blue” with increasing temperature. Attenuation I = I 0 • e - • d. Source. Observations - visible

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lab experiments
Lab Experiments
  • Distance Behavior - I = A/r2 +B
  • Definition of color - The ratio of two colors at the same distance.
  • Color and Temperature - objects get more “blue” with increasing temperature.
  • Attenuation I = I0• e-•d
source
Source
  • Observations - visible
    • for Hydrogen
    • 1/ = R(1/22 - 1/n2) , R = 1.097 •107 m-1
    • n = 3 red light  = 6562 •10-10
    • n = 4 blue light  = 4861 •10-10
    • This is an empirical formula!
    • Each atom has a unique spectrum!
    • Formulas like this, give the colors of light that come out of atoms.
bohr model
Bohr Model
  • Quantized energy levels exist in all atoms.
  • For Hydrogen the energy of each level is
    • En = 13.6/n2
  • Transitions between levels either absorb or release energy. Energy is released in the form of light packets or photons each of energy:
    • E = hc/ = hf Einstein postulates this for PE effect
    • the energy available is the difference between the two levels involved in the transition.
  • Is this consistent with the “observations” on the previous slide.
bohr empirical
Bohr & Empirical
  • E2-n = 13.6 (1/22-1/n2) Bohr theory
  • hc/  = E2-n energy emitted as a photon
  • Then 1/  = 13.6/hc (1/22-1/n2)
  • Does 13.6/hc = R ?
constants
Constants
  • R = 1.095x107 m-1
  • h = 6.626x10-34 joule-sec
  • 1 ev = 1.6x10-19 joules
  • c = 3x108 m/sec