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Hydrogen `(H)`, deuterium `(D)`, singly ionized helium `(He^(+))` and doubly ionized lithium `(Li)` all have one electron around the nucleus. Consider `n = 2` to `n = 1` transition. The wavelength of emitted radiations are `lambda_(1), lambda_(2), lambda_(3)` and `lambda_(4)` respectively. then approximately

A

`lamda _(1) = lamda_(2) = 4 lamda_(3) = 9 lamda_(4)`

B

`4 lamda_(1) = lamda_(2) = 2 lamda_(3) = lamda_(4)`

C

`lamda _(1) = 2 lamda_(2) = 2 sqrt ()2 lamda_(3) = 3 sqrt () 2 lamda_(4) `

D

`lamda_(1) = lamda_(2) = 2 lamda_(3) = 3 ssqrt() 2 lamda_(4)`

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A
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