Atoms and Nuclei Part 1

E=Rhc[‌

1

n1‌2

−‌

1

n2‌2

]
E will be maximum for the transition for which
[‌

1

n1‌2

−‌

1

n2‌2

] is maximum. Here n2 is the higher energy level
Clearly, [‌

1

n1‌2

−‌

1

n22

] is maximum for the third
transition, i.e. 2→1.I transition represents the absorption of energy.