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Q.

What element has a H-like spectrum, whose lines have wavelengths nine times shorter than those of atomic hydrogen ?

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a

He

b

He+

c

H

d

Li+2

answer is D.

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Detailed Solution

1λ=RZ21n12-1n22 1λH=R×121n12-1n22 ----(a) 1λX=RZ21n12-1n22 ----(b) Dividing (a) by (b) we get λxλH=1Z2 19=1Z2 Z=3 means Li+2 ion
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