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## Homework Statement

In a particular photocell, light with a frequency of 8×10^14Hz is directed onto the cell and it is found that a stopping potential of 1.2V is needed to reduce the photoelectric current to zero.

Calculate the work function of the metal in the cell.

## Homework Equations

E=hf

E=hc/λ

hf=[itex]\phi[/itex] + Ek

## The Attempt at a Solution

Not much luck with this. Most sources that calculate the work function require the threshold frequency first, but we don't have that. Using E=hf and E=hc/λ I managed to find the energy of the light/photon as 5.304×10^-19 and the wavelength to be 3.725×10^-7 but now I'm stuck.