The light sensitive substance in black and white photography film is AgBr. photons provide the energy necessary to transfer an electron from Br- to Ag+ to produce Ag and Br.
a) if a minimum energy of 2.00×10^5J/mol is needed for this process, what is the minimum energy needed by each photon?

Question

The light sensitive substance in black and white photography film is AgBr. photons provide the energy necessary to transfer an electron from Br- to Ag+ to produce Ag and Br. 
a) if a minimum energy of 2.00×10^5J/mol is needed for this process, what is the minimum energy needed by each photon?

sunnnystrong · Answer

Energy States:
$$En=E _{0}(\frac{ Z^2 }{ n^2 })$$
En=energy state in joules
n=shell #
Z=atomic #
Eo=ground state of Hydrogen electron (-2.178*10^(-18) J/n^(2))

$$\lambda = \frac{ hc }{ \Delta E }$$

Delta E= Ef-Ei
h=Planck's Constant (6.6262*10^(-34) m^(2)/s
c= speed of light (2.998*10^(8) m/s)

$$c=\lambda \nu $$
c=speed of light
lambda=wave length
nu=frequency