In a transition to a state of excitation energy 10.19eV , a hydrogen atom emits a $\;4890 A^{0}\;$ photon . Then the binding energy of initial state is :

Question

$(a)\;-1.2 eV\qquad(b)\;-2.4 eV\qquad(c)\;-0.87 eV\qquad(d)\;-3.4 eV$