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Xa+ and Yb+ are hydrogen-like species. The wavelength of light absorbed during the transition between the states with principal quantum numbers n=1 and n=2 of Xa+ is . The wavelength of light absorbed during the transition between the states with principal quantum numbers n=2 and n=4 of Yb+ is 9 . The lowest possible value of (a+b) is .
JEE Advanced 2026 Paper 2