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*White light, with frequencies ranging from 4.00 x10^14 Hz to 7.85x10^14 Hz, is incident on a potassium surface. Given that the work function of potassium is 2.24 eV, find the following values.*

(a) the maximum kinetic energy of electrons ejected from this surface

eV

(b) the range of frequencies for which no electrons are ejected

minimum -

maximum -

(a) the maximum kinetic energy of electrons ejected from this surface

eV

(b) the range of frequencies for which no electrons are ejected

minimum -

maximum -

For part a) I used the formula e=hv, as described by Planck. For Planck's Constant h I used a value of 6.62x10^-34 and for my frequency v I used the highest value in the range i.e. 7.85x10^14 in order to yield the highest K.E. but I came up with an answer of 5.205x10^-19 which is wrong...can someone point me in the right direction? Thanks.