Hydrogen 􀀋 1 􀀌 1H , Deuterium 􀀋 2 􀀌 1H , singly ionised Helium 􀀋 4 􀀌 2He 􀀎 and doubly ionised lithium 􀀋 6 􀀌 3 Li 􀀎 􀀎 all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1. If the wavelengths of emitted radiation are 􀁏1, 􀁏2 , 􀁏3 and 􀁏4 respectively then approximately which one of the following is correct?

 

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Answer: c