A) of phenomenon of fluorescence
B) it reflect red light
C) both of the above
D) none of the above.
Correct Answer: A
Solution :
: Fluorescence is the phenomenon of immediate emission of long wave radiations by a substance after having absorbed radiation energy. Chlorophylls usually show red fluorescence though they absorb blue radiations as well. When blue light shines on isolated chlorophyll (i.e., cholorphyll that is removed from the plant and thus separated from the proteins that convert the light energy into chemical energy), the absorbed light energy has nowhere to go and it comes right back out as red light. This red light is not actually reflected light; it is light that is absorbed by the leaf, changed and re-emitted as red. This is due to the phenomenon of fluorescence. Plant leaves are green because they contain large amounts of chlorophyll, which absorbs most strongly in blue and red light, leaving the intermediate green wavelengths to be reflected to our eyes. White light is made up of all wavelengths (colors). Objects appear coloured when they absorb or reflect different wavelengths of light to different degrees. The colour that we see is the transmitted or reflected colour. Chlorophyll helps to convert light energy into chemical energy by absorbing electromagnetic radiation.
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