Why does the AgBr photolysis reaction require light and not other energy forms?

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shihab-kol
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AgBr →Ag + Br2
This reaction takes place in presence of light energy, but why only light ?? Why not electricity, heat or any other forms of energy?
 
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No. Light definitely speeds the reaction up, but it is not the only way to make it happen.
 
shihab-kol said:
AgBr →Ag + Br2
This reaction takes place in presence of light energy, but why only light ?? Why not electricity, heat or any other forms of energy?
Because it involves excited state dynamics. Heat and other forms of energy deals with ground state dynamics (it is theoretically possible to produce excited states with any form of energy, but it is realistically impossible due to the scale of energy required).