With what equation and what numbers to plug in, i can do the rest.
the retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 j. for light of 565 nm wavelength , how many photons does this energy correspond to?

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants