One line in the spectrum of the neutral helium atom (He) is bright yellow light with a wavelength = 587.6 nm. This line is used in an experiment to produce photoelectrons.

(a) Calculate the energy difference in eV between two helium energy levels that produce this line.

(b) Calculate the maximum kinetic energy of the photoelectrons for two target metals with work functions = 2.16 eV (rubidium) and = 1.80 eV (cesium) when the yellow He-line is incident on them. Justify your answers