(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Monochromatic light with a wavelength 415 nm strikes a metal surface. Photoelectrons escape with a kinetic energy of 95 kJ/mol. What is the work function (in kJ/mol, no decimals required) of the metal surface?

2. Relevant equations

I have found various equations online relating to work function, and I have tried most of the ones that seemed like they would work, but I am still at a loss as to which equation is correct, and if I am completing the problem correctly. Some of the equations I found are:

Φ = hc/λ, where h is Planck's constant.

Φ = hfo, where fo is the minimum frequency of a photon

hc/λ = wf + KE, where wf is work function and KE is kinetic energy

3. The attempt at a solution

All of my attempts at finding a solution have resulted in -95. I have no idea if this is correct, but my best guess at solving the problem was using the last equation because I had wavelength and kinetic energy. I converted the wavelength to 4.15e-7 m..divided hc by wavelength.. subtracted kinetic energy... still get -95.

Thanks in advance to any help =)

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# Light stikes metal surface; determine work function

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