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Consider a hypothetical atom with four different energy levels, at −6.0 eV, −1.2 eV, −1.0 eV...

Consider a hypothetical atom with four different energy levels, at −6.0 eV, −1.2 eV, −1.0 eV and −0.4 eV. In this atom’s emission spectrum, the photon of the spectral line with the lowest frequency has energy

(A) 0.2 eV

(B) 0.4 eV

(C) 0.6 eV

(D) 6.0 eV

(please explain answer)

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