Cesium(Cs) is used extensively in television cameras and in photocells because it has lowest ionization energy of all the stable elements.Determine the maximum kinetic energy of a photo electron ejected from cesium by 555nm light? if the wavelength of the light used to irradiate the cesium surface become longer than 600 nm, no photoelectrons are emitted. use the rest mass of the electron to compute the velocity of the photoelectron?