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[" 11.The wavelength of the first Lyman ...

[" 11.The wavelength of the first Lyman lines of "],[" hydrogen,He "^(+)" and Lit ions are "lambda_(1),lambda_(2),lambda_(3)." Then,- "],[" the ratio of these wavelengths is "],[[" (1) "1:4:9," (2) "9:4:1],[" (3) "36:9:4," (4) none of the above "]]

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