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In which of the following system will the wavelength corresponding to `n = 2 to n= 1`be minimum ?

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In which of the following system will the wavelength corresponding to `n = 2 to n= 1`be minimum ?
A. hydrogen atom
B. deuterium atom
C. singly ionized helium
D. doubly ionized lithium
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Correct Answer - D
`(1)/(lambda)=Z^(2) R((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))`
`lambda prop (1)/(Z^(2))`
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