- #1

KevinFan

- 47

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## Homework Statement

The binding energy of an electron to a metal surface is (3.90x10^2) kJ/mol. What is the

**threshold wavelength (in nm)**for the onset of the photoelectric effect?

## Homework Equations

## The Attempt at a Solution

work function= 3.9*10^2 kj/mol=6.476103179*10^-19j

I know I have to calculate the threshold wavelength of the electron, lambda=h/p

and p=mv. mass of an electron is known, and h is a constant, the velocity of the electron is the key to solve this question.

I am thinking using "E=hv=(1/2)mu^2+work function" but I don't know "E".

Any leads would be great!