The element Be has 4 electrons and 4 protons in the atom. An ion of Be has all the electrons removed except 1, so it resembles a hydrogen atom with a nuclear charge of +4 e.
E1(Hydrogen)= -13.6eV, r1(Hydrogen)= 5.29x10-11m.
If a gas is made up of ions, as described, in their lowest energy states, and is bombarded with white light, what is the longest wavelength, in nm, which will be absorbed ?
λ = hc/E
The Attempt at a Solution
Total energy of the lowest energy state = E = -13.6* no. of protons^2 / n^2 = ((-13.6 * 4^2)/1^2) = -217.6
λ = hc/E = (6.63 E –34 * 3E+8) / (-217.6 * 1.602E-19) = -5.7E-9 m = -5.7 nm
the answer is 7.625nm....
White light doesn't have a wavelength...I have no idea to solve this