A1 Bohr predicted that the ground state energy of Hydrogen is: 4 E = H 2(47r60)2h?a Where ,u is the reduced mass of the electron and proton, and the ground state radius a0 is: 47reoh2 a0 = 2 Me For Hydrogen, ,u % me. Positronium is an \"atom\" formed by a positron and an electron. A positron has the same mass as the electron. Find the ground state energy and radius of Positronium in terms of EH and a0. [4 marks]