$\bar v\,\, = \,\,\frac{1}{\lambda }\,\, = \,\,R{Z^2}\left( {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right)$ અથવા 

$\bar v\,\, = \,\,{Z^2} \times R\left( {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right)\,\,\,\,\,for\,\,H,\,Z\,\, = \,\,1\,\,\bar v = R\left( {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right)\,\, = \,\,15200\,\,c{m^{ - 1}}$

$Li^{+2}$ આયનની બામર શ્રેણીની પ્રથમ રેખાની તરંગ સંખ્યા

$\bar v = {Z^2} \times R\left( {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\{ \because \,\,Z = 3\,\,for\,\,L{i^{ + 2}}\} $

$\bar v\,\, = \,\,{3^2} \times 15200 = 9 \times 15200 = 136800\,\,c{m^{ - 1}}$