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NEET - 2011

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number Z of hydrogen-like ion is 

(a) 4                                                  (b) 1

(c) 2                                                  (d) 3

Lyman series for H-ion

                    hcλ=Rhc112-122

and for H-like ion 

                     hcλ=Z2Rhc122-142

112-122=Z214-116          1-14=Z214-116                      Z=2

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