1. The problem statement, all variables and given/known data A beam of light of 300nm is shone at a metal surface of work function 2.25eV. The power of the light striking each square centimeter is 1 microW. A total of 3cm^2 is illuminated by the beam. If each photon caused an electron to be ejected, what current is produced? 2. Relevant equations E = hf - (work function)] P/V = I E = hf 3. The attempt at a solution I calculated each electron emitted to have 1.89eV, and for each square centimeter, 1.51x10^12 photons strike per second, So, I try to use P/V = I, using P = 3microwatts and V = 1.89eV, which gives me an answer of 1.59microamps. However, the answer given in the book is 0.726microamps. Can anyone see where I'm going wrong, or any concepts I'm not understanding correctly? Thanks for any help!