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For a single ionised helium atom, the lo...

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

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda=(912)/(Z^(2)((1)/(n_(1)^(2))-(1)/(n_(2)^(2)))) `
`lambda=912/3=304`Å
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