Calculate the energy emitted when electrons of `1.0` gm atom of Hydrogen undergo transition giving the spectral lines

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Q 2622780631.     Calculate the energy emitted when electrons of `1.0` gm atom of Hydrogen undergo transition giving the spectral lines of lowest energy in visible region of its atomic spectra. Given that, `R_H = 1. 1 xx 10^7 m^(-1) , c = 3 xx 10^8 m // s, h = 6. 625 xx 10^(-34) J s`.

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