The silver iodine bond energy is approx 255kJ/mol. (AgI is one of the active components in photography sunglasses). What is the longest wavelength of light capable of breaking the bond in silver iodine?© BrainMass Inc. brainmass.com March 4, 2021, 6:20 pm ad1c9bdddf
Bond eneregy = 255*10^3 joules/mol. The incoming photons must be able to supply this much amount of energy per mole to completely break the bonds.
This is for one mole; but ...
The process is key to the sensitivity of photographic films. A detailed explanation is given.