Assume that the energy (electric potential energy) is zero for an electron that is infinitely far from a proton, would the energy be positive or negative for an electron that is bond inside an atom? A

Assume that the energy (electric potential energy) is zero for an electron that is infinitely far from a proton, would the energy be positive or negative for an electron that is bond inside an atom? An electron in an atom transitions from an atomic energy level of -1.5eV to a level of -3.4eV, will this electron emit or absorb a photon? What is the wavelength of the photon? (1