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Q.

WHAT is photochemical change

Tags: careers, computers & internet, law & legal
Asked by soumyaa, 26 Jan '13 03:39 pm
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Answers (3)

1.

Photochemical events in vision involve the protein opsin and the cis/trans isomers of retinal. Opsin does not absorb visible light, but when it is bonded with 11-cis-retinal to form rhodopsin, which has a very broad absorption band in the visible region of the spectrum. The peak of the absorption is around 500 nm, which matches the output of the sun closely.

Upon absorption of a photon of light in the visible range, cis-retinal can isomerize to all-trans-retinal. The shape of the molecule changes as a result of this isomerization. The molecule changes from an overall bent structure to one that is more or less linear. All of this is the result of trigonal planar bonding (120 o bond angles) about the double bonds. Compare Cis and Trans-Retinal
Answered by ajay, 26 Jan '13 03:43 pm

 
  
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2.

Which kinds of change occur due to sunlight/ light!!
Answered by sanjay karmakar, 26 Jan '13 03:42 pm

 
  
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3.

U he ji
Answered by wenz, 26 Jan '13 03:42 pm

 
  
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