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in a photoelectric effect, it is found that incident photons with energy 5.00 eV will produce electrons with a maximum kinetic energy 3.00 eV. What is the threshold frequency of this material?

the equation i have to work with is KE=hf-hf(sub t) and here the way to figure out threshold freq is to solve for f(sub t) with would equal

hf-KE/h

and KE would be found--i guess--by multiplying (3)(1.6e10^-19)

i did al that but i dont know what the 5.00 eV is and what the frequency is

thanks in advance

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# Threshold frequency in light

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