The ratio of ionization energy of Bohr's hydrogen atom and Bohr's hydrogen-like lithium atom is

Energy of an electron in ground state of an atom (Bohr's hydrogen-like atom) is given as E=−13.6Z2 eVZ=atomic number of the atom⇒Eionisation=13.6Z2⇒EionHEionLi=ZHZLi2=132=19