JEE Main 2014 Question Paper

Hydrogen(1H1),Deuterium(1H2),singly ionised Helium(2He4)+ and doubly ionised Lithium (3Li6−)++ 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 on of the following is correct ?