##13.6eV## for first ionisation energy of hydrogen.
The Rydberg equation for absorption is
##1/lambda = R(1/n_i^2 – 1/n_f^2)##
Where ##lambda## is the wavelength of the absorbed photon, R is the Rydberg constant, ##n_i## denotes the energy level the electron started in and ##n_f## the energy level it ends up in.
We are calculating ionisation energy so the electron goes to infinity with respect to the atom, ie it leaves the atom. Hence we set ##n_f = oo##.
Assuming we ionise from the ground state, we set ##n_i = 1##
##1/lambda = R##
##E = (hc)/lambda implies E = hcR##
##E = 6.626xx10^(-34)*3xx10^8*1.097xx10^7 = 2.182xx10^(-18)J##
When we deal with such small energies, it is often helpful to work in electron volts.
##1eV = 1.6xx10^(-19)J ## so to convert to eV we divide by ##1.6xx10^(-19)##
##(2.182xx10^(-18))/(1.6xx10^(-19)) = 13.6eV##
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