Question

Silver bromide is used in light-sensitive black-and-white film. When photons hit the film, the energy they provide, produces silver and bromide from the ionic AgBr and this is how the film is darkened.

a. In order to convert AgBr in Ag(s) and Br2(g), it requires 2.00 x 105 J/mol, what is the minimum energy needed by each photon? (Assume that each photon interacts with one AgBr formula unit)

b. Calculate the wavelength of the light necessary to provide photons of this energy.

c. Explain why darkrooms use red light, and why the film can be handled under red light despite being sensitive to other light

Answer 1