(4) 1.587 x 10-10 m. Wave number for limiting line of Lyman series of H-atom is- (R = 109678 cm-1) (1) 82259 cm (29109678 cm (3) 1.2157 x 10-5 cm (4) 9.1176 x 10 cm of buedrogen

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Wave number ( =Rleft[frac{1}{n_{1}^{2}}-frac{1}{n_{2}^{2}}right] z^{2} ) ( =109678left[frac{1}{10}-frac{1}{2^{2}}right] ) ( =109678left[frac{1}{10}right]_{4 n}^{2} ) ( =109678 mathrm{s} )

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