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Question

What is the maximum wavelength line in the Lyman series for He+ ion?

A
3R
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B
13R
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C
44R
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D
None of these
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Solution

The correct option is B 13R
For He+, Z=2
Wave number, v=1λ=RZ2[1n211n22]

For Lyman series, n1=1 and for maximum wavelength, n2 has to be the smallest possible energy level.
n2=2
Therefore,
1λmax=4R[1114]

λmax=13R


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