Irradiated with light of three different wavelengths λ₁ , λ₂ , and λ₃ . the kinetic energies of the ejected electrons are as follows: λ₁ : 7.2 x 10⁻²⁰ j; λ₂ : approximately zero; λ₃ : 5.8 x 10⁻¹⁹ j. which light has the shortest wavelength and which has the longest wavelength? determine the threshold frequency, νo, for this metal