Q-3 The wavelength of the third line of the Balmer series for a hydrogen atom is - 100 21 (A) 100R. 100R 21R. (B) 21R. (C) TOO (D) 21

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( left.frac{1}{lambda} cdot frac{f}{2^{2}} cdot frac{1}{n^{2}}right] ) ( frac{1}{lambda}=left[begin{array}{ll}frac{1}{4}-frac{1}{25}end{array}right. ) ( 1=frac{left(frac{20-4}{100}right)^{2}}{frac{100}{21 R}} )

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