Photochromic sunglasses, which darken when exposed to light, contain a small amount of colourless AgCl(s) embedded in the glass. When irradiated with light, metallic silver atoms are produced and the lass darkens. `AgCl(s)toAg(s)+Cl` Escape of chlorine atoms is prevented by the rigid structure of the glass and the reaction therefore, reverses as soon as the light is removed. if 310 kJ/mol of energy is required to make the reaction proceed, what wavelength of light is necessary.?

Photochromic sunglasses, which darken when exposed to light, contain a

1.	Photochromic sunglasses, which darken when exposed to light, contain a small amount of colourless AgCl(s) embedded in the glass. When irradiated with light, metallic silver atoms are produced and the lass darkens. `AgCl(s)toAg(s)+Cl` Escape of chlorine atoms is prevented by the rigid structure of the glass and the reaction therefore, reverses as soon as the light is removed. if 310 kJ/mol of energy is required to make the reaction proceed, what wavelength of light is necessary.?
Answer» Energy per mole=Energy of one Einstein, i.e., energy of one mole quanta `=(Nhc)/(lamda)` `therefore310xx1000=(6.023xx10^(23)xx6.626xx10^(-34)xx3xx10^(8))/(lamda)` `lamda=3.862xx10^(-7)m=3862xx10^(-10)m=`3862Ã…

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