Sig figs for Atomic Spectrum Questions [ENDORSED]

[Hanyi Jia 3B]

In typical atomic spectrum questions, measurements are not likely to occur. Instead, the questions give exact numbers for the energy levels. (E.g. an electron come back from n=4 to n=1)
I wonder how many sig figs will we take when we have to calculate the energy released/wavelength/frequency of the light emitted. Is there a default number of taking 3? (I know there are infinite sig figs in these calculations theoretically.)

[Molly Smith 1J]

In these questions, there will most likely be another value provided than just the energy levels. This other value could be a constant, wavelength, etc. The number of significant figures in that value should be sufficient. Hope this helps!