Question

the range of electronic excitation

Answer 1

Annu Rev Biochem. 1971;40:83-114. Long- range nonradiative transfer of electronic excitation energy in proteins and polypeptides .

Answer 2

The question is asking what wavelengths of light can cause electronic excitation in organic compounds, i.e. what energy photons correspond to the energy difference between the ground and excited states. They're not the same in all compounds (which is why different compounds have different absorbance spectra), but there is a range of energies in which most of the electronic transitions in organic compounds occur.

I think an important component of the question is whether, for example, there are compounds that will have electronic excitations at 200 nm, 220, 250, 290nm, etc. and the same for the long wavelengths (i.e., will anything have an electronic excitation at 1000 nm?