Calculate the maximum wavelength of light capable of removing an electron for a hydrogen atom from the energy state of n=4 if it requires an energy of at least 1.36 x10^-19 J to do this.

Question

Please help with formulas to use?

Answer 1

1/wavelength = R[1/(N^2)1 -1/(N^2)]2
R = 1.07937E7 in meters
N1 = 4 so N^ is 16
N2 is infinity so 1/infinity = 0