# Photoelectric effect

1. Nov 11, 2008

### xago

1. Platinum has a very high work function of wo = 6.35 eV.What is the maximal photo current Io that can be achieved with an irradiation power of
P = 1.27 W ?

2. Relevant equations
hf = wo

3. The attempt at a solution
Well, Since the only information they give here is the work function, then i assume that it is related to the voltage. I'm trying to use P=VI to find I but it's the voltage part thats confusing me.

2. Nov 11, 2008

### nasu

The current is charge per unit time so it will depend on how many electrons can you break free in one second.
For each one you need the energy wo.
The given power tells you how much energy is available per second...