The energy levels of a hypothetical one electron atom are given
`E_(n) = - (18.0)/(n^(2)) eV`, where ` n = 1,2,3` …
a Cumpete the four lowest energy levels and construct the energy level diagram .
b What is the excitation potential of the state ` n = 2`?
c What wavelengths `(Å)` can be emitted when these atoms in the ground stste are bombarded by electron that have been accelerate through a potential difference of `16.2 V`
d If these atoms are in the ground state , can they absorb radiation having a wavelength of `2000 Å` ?
e what is the photoclectric threshold wavelength of this atom ?

Explanation

(a) `E_4 =-3.4 eV, E_3=-6.04 eV, E_2=- 13.6 eV, E_1=-54.4 eV`
(b) 7.56 eV,(c ) `lambda_(32)=1645A^@,lambda_(31)=257A^@, lambda_(21)=304 A^@`
No