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Given the value of Rydberg constant is $10{m}^{-1}$, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

(a) $0.5×{10}^{7}{m}^{-1}$        (b) $0.25×{10}^{7}{m}^{-1}$

(c) $2.5×{10}^{7}{m}^{-1}$        (d) $0.025×{10}^{4}{m}^{-1}$

NEET