Question

the minimum frequency of light needed to eject electrons

The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, v_0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.03 times 10^14 s^-1. With what maximum kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of lambda = 285 nm? KE_electron =