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When table salt is put in a candle ﬂame, it burns bright yellow because of emission from the sodium atoms. This emission is at 590 nm. (a) What is the natural resonant frequency of the

sodium atom that produces this emission (i.e. what is the frequency of this light)? (b) What is the diﬀerence in energy between the two levels of the sodium atom that are responsible for this emission (i.e. what is the energy of a photon

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