Lecture 2-Light and Life

Lecture 2-Light and Life - Lecture 2 Light and Life The...

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Lecture 2- Light and Life The Electromagnetic Spectrum -Visual light only from 380-790nm -Light is electromagnetic radiation -Inverse relationship between wavelength and energy (i.e., short wavelength, higher energy) -Red has a longer wavelength than blue -Waves reflected is the colour you see; the absorbed colour you can not see -Pigments that absorb light are composed of conjugated double bonds INSERT PIGMENT MOLECULES HERE ^^^^^^^^^^^^^^^^^^^^^^ Einstein-Stark Law -1 photon of light excites one electron Grothus-Draper Law -The amount of energy required to excite one electron must match perfectly to the colour Light -Photons, quanta (particles of energy) -Energy amount is perfect for biology, not too much energy to destroy proteins, etc -Most dominant form of electromagnetic energy on the face of the earth Conjugated Double Bonds -Leads to delocalization of electrons (can interact with light) Cataracts -Lens of the eye becomes cloudy -Protein has changed shape -Blues and greens not seen as well, more yellow and red
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This note was uploaded on 04/04/2009 for the course PSYCH 1000 taught by Professor Atkinson during the Spring '09 term at UWO.

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Lecture 2-Light and Life - Lecture 2 Light and Life The...

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