Hydrogen H11, Deuterium H21, singly ionised Helium H2e4+ and doubly ionised lithium L3i6++ all have one electron around  the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are λ1, λ2, λ3 and λ4 respectively then approximately which one of the following is correct [JEE (Main) 2014]

(1) 4λ1=2λ2=2λ3=λ4                  (2) λ1=2λ2=2λ3=λ4

(3) λ1=λ2=4λ3=9λ4                    (4) λ1=2λ2=3λ3=λ4

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