Determine the wavelength and colour of visible light that contains enough energy to eject an electron off a metal with a work function of 3eV? Take 1 J = 6.24 x 1018 eV and h = 6.63 x 10-34 J. s

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?