1. The problem statement, all variables and given/known data How many photon/s are emitted by a green light (λ= 500 nm) 60 W incandescent bulb? Assume an efficiency of 2%. 2. Relevant equations c= wavelength(f) c=speed of light E=hf 3. The attempt at a solution im not sure which equation to use here, i dont know what to do with the 60 W and the efficiency of 2 percent.