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For a single ionised helium atom, the longest wavelength in ground state will absorb

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For a single ionised helium atom, the longest wavelength in ground state will absorb
A. 912 Å
B. 304 Å
C. 606 Å
D. 1216 Å
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Correct Answer - B
`lambda=(912)/(Z^(2)((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))) `
`lambda=912/3=304`Å
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