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## Homework Statement

A magnesium surface has a work.func of 3.68eV. El.mag. waves with wavelenght of 215nm strike the surface and eject electrons. Find the max Ek of the ejected electrons in eV.

## Homework Equations

E=Ek-W <=> Ek=(hc/lambda) - W

## The Attempt at a Solution

I convert eV to J and nm to m but i get -3.68*10^10eV, but the answer is suppoused to be 2.10eV.

I even re did it but got the same answer, where em I going wrong?

Thanks