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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 18 - Atoms and Nuclei > Hydrogen (1H^1), deuterium (1H^2) singly ionised helium (2He^4)+ and doubly ionised lithium (3Li^8)++ all have one electron around the nucleus. Consider an electron transition from n = 2 to n=1. If the wavelengths of emitted radiation are λ1,λ2,λ3 and λ4, respectively for four elements, then approximately which one of the following is correct?

Hydrogen (1H^1), deuterium (1H^2) singly ionised helium (2He^4)+ and doubly ionised lithium (3Li^8)++ all have one electron around the nucleus. Consider an electron transition from n = 2 to n=1. If the wavelengths of emitted radiation are λ1,λ2,λ3 and λ4, respectively for four elements, then approximately which one of the following is correct?

Hydrogen (1H1) Radiation com in g from transitions n = 2 to n = 1 of hydrogen atoms fall on He+ ions in n = 1 and n = 2 states. The possible transition of helium ions as they absorb energy from the radiation is :