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Radiation Curves

Radiation Curves. 400nm 500nm 600nm 700nm. Continuous Radiation. How bright is the continuous spectrum at different colors? How does a perfect light source emit its light?. Early Experiments. Blackbody Radiation. Darken inside with carbon black.

colleen-beach
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Radiation Curves

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  1. Radiation Curves

  2. 400nm 500nm 600nm 700nm Continuous Radiation • How bright is the continuous spectrum at different colors? • How does a perfect light source emit its light?

  3. Early Experiments Blackbody Radiation Darken inside with carbon black Measure radiation that emerges from hole

  4. Blackbody Radiation Vis UV IR

  5. Changes with Temperature Visible * 7000 K * 6000 K * 5000 K

  6. Wien’s Displacement Law • The wavelength of the peak of the blackbody curve is inversely proportional to the temperature. Wilhelm Wien Cool stars are red - hot stars are blue

  7. Total Energy

  8. Stefan-Boltzmann Law • Area under the blackbody curve measures the total energy output of the source and is proportional to T4. Ludwig Boltzmann Josef Stefan

  9. Blackbody Radiation • Everything in nature emits light • The type of light emitted depends on the temperature of the source • The walls of this room • IR • Stars • Visible and UV • The Corona of the Sun (2,000,000 K) • X-rays

  10. ORION

  11. Some Real Stars Rigel 11500 K Sirius A 10000 K The Sun 5800 K

  12. More Real Stars The Sun 5800 K Capella 5200 K Betelgeuse 3600 K

  13. Review • Animation

  14. Continuous Emission Absorption Two-Dimensional Spectra

  15. The Orion Nebula Visible Light Infrared Light

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