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bw1990
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Homework Statement
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?
Homework 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
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 =)