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Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is 
(a) Balmer series                (b) Lyman series
(c) Paschen series               (d) Pfund series

(Rydberg constant R = 1.097×107 per metre)

(c) 1λ=R1n12-1n221n12-1n22=1     = 11.097×107×18752×10-10=0.0486=7144

But 132-142=7144n1=3 and n2=4  (Paschen series)

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