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Scattering and Absorption

Scattering and Absorption

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Scattering and Absorption

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  1. Scattering and Absorption How does the color of the aerosol affect the light energy hitting it? Photo: L. Harkness

  2. Scattering: light energy hits and bounces off a substance in different directions, causes cooling • Absorption: light energy taken in by substance, causes warming Notes http://ww2010.atmos.uiuc.edu/guides/mtr/opt/mch/gifs/sct1.gif

  3. Albedo: the ability of a substance to reflect back light energy (snow – high albedo; blacktop – low albedo) Notes

  4. Light Energy: energy coming from the sun; also known as electromagnetic energy Notes http://chemwiki.ucdavis.edu/@api/deki/files/9199/675px-EM_Spectrum_Properties_edit.svg.png?size=bestfit&width=675&height=400&revision=1

  5. Describe what you see in the bottle with only compressed air. • How are the results different after aerosol particles (smoke from the matches) were added? Video Notes

  6. Click here for the video!! Video: Bill Nye Cloud in a Bottle Experiment

  7. It’s a hot summer day. Which color shirt do you decide to wear, white or black? Why?? Experiment

  8. Each group with be testing both pure snow and snow with soot. • Make sure you take detailed observations, including color, temperature, changes you see • Record your data on your lab handout • Be prepared to explain changes you see taking place Experiment

  9. Each group with design an experiment using the materials provided. • Once you have written you lab procedures, get them approved before moving on. • When you start your experiment, make sure you take detailed observations, including color, temperature, changes you see • Record your data on your lab handout • You will be completing a full lab report upon completion Alternate Experiment

  10. At the conclusion of the experiment, you will write a full lab report with the following sections: • Introduction (include the problem or question and your hypothesis) • Materials (what did you use) • Procedure (how did you conduct your experiment) • Observations (what did you see taking place) • Data Tables and Graphs • Analysis/Discussion (interpret evidence) • Accept or Reject Hypothesis Lab Report