The work function of certain metal is 5.37 eV. Calculate the kinetic energy and the speed of the ejected electrons ejected by a laser of 203 nm wavelength.
Given 1 eV = 1.602 × 10−19 J, h = 6.626 × 10−34 J s, me = 9.109 × 10−31 kg, and c = 2.998 × 108 m/s.
* Answer in km/s