As we know that binding energy is defined as the energy released when its constituents are brought from infinity to from the system. Thus here the initial sta

te will be m=2 and this state is reached after bringing the constituent from infinity, so n=∞.

Now, the energy of hydrogen atom is given by,

Where 13.6 is the binding energy of the hydrogen atom

So, if we consider transition state from infinity to n=2, we have