Question

When light of wavelength 130 nm falls on a cobalt surface, electrons having a maximum kinetic energy of 4.55 eV are emitted. Find values for the following.
(a) the work function of cobalt (in eV)
(b) the cutoff wavelength (in nm)
(c) the frequency corresponding to the cutoff wavelength (in Hz)
KE emitted=workfunction+incomingenergy

incomingenergy= Plancksconstant(c/lambda)

solve for work function

cutoff wavlength
c/lambdacutoff= work function

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