1 / 12

Absorption Spectra of Chlorophyll

Science is facts; just as houses are made of stone, so is science made of facts; but a pile of stones is not a house, and a collection of facts is not necessarily science. Jules Henri Poincaré (1854-1912) French mathematician. Absorption Spectra of Chlorophyll. Electromagnetic Spectrum.

velma
Download Presentation

Absorption Spectra of Chlorophyll

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Science is facts; just as houses are made of stone, so is science made of facts; but a pile of stones is not a house, and a collection of facts is not necessarily science. • Jules Henri Poincaré (1854-1912) French mathematician. Absorption Spectra of Chlorophyll

  2. Electromagnetic Spectrum

  3. Measuring Light • Irradiance:measure of the amount of energy falling on a flat surface (amount per unity area) • Intensity: the amount of light leaving a light source • Photon: particle of light • Quanta: energy in a photon • PPFD: Photosynthetic Photon Flux Density (amount per unit area) • PAR: photosynthetically active radiation • (~350nm-700nm)

  4. Measuring light • Photometric • Based on our eye’s ability to detect electromagnetic radiation • Units are: foot-candles (fc) or lumens m-2 (lux)

  5. Measuring light • Radiometric • Based on actual spectral distribution • Units are: • Energy = W m-2 • Number of Photons = umole-m-2-s-1 Why do physiologists like photons?

  6. Photosynthesis: 1. Conversion of light energy to chemical energy. 2. Short term storage of chemical energy. 3. Long term storage of chemical energy.

  7. Basic principle of Photo-Chemistry One photon-------One Excitation

  8. Absorption Spectra of Chlorophyll

  9. Questions to answer using figure 1. • What is the effect of the atmosphere on direct sunlight? • Look at the “Direct Sunlight at Sea Level” line. What causes all the dips in the infra-red? • What colors (wavelengths) of light are selectively adsorbed by clouds? • What color is sky light? • Can you tell from this graph why leaves are green? • What is the significance of the lack of absorbance of infra-red radiation by vegetation?

  10. http://www.youtube.com/profile?user=greatpacificmedia#p/u/58/D6tbOBhbOZUhttp://www.youtube.com/profile?user=greatpacificmedia#p/u/58/D6tbOBhbOZU

More Related