What you have written makes no sense. If "v" is the "speed of the ejected electron", it cannot also be the "frequencey of the incoming radiation". I suspect you mean that "h" is the frequency of the incoming radiation. But then the energy of the incoming radiation is given by hc, where c is the speed of light, not hv.

The kinetic energy of an eletron of mass and velocity v is, by definition, .

"Conservation of energy" says that the total energy of the radiation, must be equal to the total energy of the electron, plus the energy required to "knock" it off the atom, the "ionization energy", I.