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If n(1) and n(2) are the boundary value ...

If `n_(1)` and `n_(2)` are the boundary value principal quantum numbers of a portion fo spectrum of emission spectrum of `H` atom, determine the wavelength ( in metre ) corresponding to last line ( longest `lambda)` . Given `:n_(1) + n_(2) =7, n_(2)-n_(1)=3` and `R_(H)=1.097xx10^(7)m^(-1)` . ( Give your answer in multiple of `10^(-6))`

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