\(\therefore \,\,{E_4}\,\, = \,\,\frac{{ - 2.18\, \times \,{{10}^{ - 18}}}}{{{4^2}}}\,\,\, = \,\, - 0.136\,\, \times \,{10^{ - 18}}\,J\,ato{m^{ - 1}}\)
ઉત્સર્જિત શક્તિ = \(-2[2.18×10^{-18} - (0.136×10^{-18})] = - (2.18 - 0.136) × 10^{-18} = - 2.044 ×10^{-18} \,J\, atom1\)
\({\text{E = hv }}\,\therefore \,\,v\,\, = \,\,\frac{E}{h}\,\, = \,\,\frac{{2.044\, \times \,{{10}^{ - 18}}}}{{6.626\, \times \,{{10}^{ - 34}}}}\,\, = \,\,3.08\,\times{10^{15}}\,{s^{ - 1}}\)