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Wave number of the first line in the Bal...

Wave number of the first line in the Balmer series of `Be^(3+)` is `2.5×10^(5)``cm^(-1)` .Wave number of the second line of the Paschen series of `Li^(2+)` is (A) `7.2×10^(4)``cm^(-1)` (B) `7.2×10^(5)``cm^(-1)` (C) `7.2×10^(-4)``cm^(-1)` (D) `1.8×10^(4)``cm^(-1)`

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