$module$/Default for Homework 9 due 10//6/positronium positronium Calculate the ground state energy of positronium. Positronium is a hydrogen-like “atom,” but consisting of an electron and a positron rather than an electron and a proton. A positron has the same charge as a proton but the same mass as an electron (it is the anti-matter equivalent of an electron).  [No online answer for this question.] 1 0 0 0