The atom emits an electromagnetic wave with a length of 256 nm, passing from a higher energy level to a lower one

The atom emits an electromagnetic wave with a length of 256 nm, passing from a higher energy level to a lower one. What length of electromagnetic wave is absorbed by the same atom, passing back from the lowest to the highest energy level?

The emission spectrum matches the absorption spectrum, so the atom will absorb radiation of the same wavelength – 256 nm.

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