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Ef - Ei = E = - 13.6 - (-1.5) = 12.1 eV
Is this is correct way of doing it? or should I be using the formula 1/wave length=R(1/n^2f - 1/n^2i) ??
Energy of an electron is negative in an atom since conventionally energy is considered "zero" when electron is at infinity. So in any orbit around the nucleus energy will be negative. In the first orbit of H acc. to Bohrs's theory energy is calculated as -13.6eV.and 1.5 ~ 13.6/9 as energy inversely varies as square of 'n'