Using the finite basis set and time-independent perturbation approaches, calculate the energy separations between the first and second electron levels and between first and third energy levels over the range of fields (from f 0 to f 2) and plot these on a graph. 1.

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in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.