Question

Photochromic sunglasses, which darken when exposed to light, contain a small amount of colorless AgCl embedded in the glass. when irradiated with light, metallic silver atoms are produced (AgCl -> Ag + Cl), and the glass darkens. Escape of the chlorine atoms is prevented by the rigid structure of the glass, so the reaction reverses as soon as the light is removed.

If 312 kj/mol of energy is required to make the reaction proceed, what wavelength of light, in nanometers, is necessary to darken the sunglasses?

Answer 1