Final answer:
When an electron jumps from energy level 1 to energy level 3 in an atom, it absorbs energy to transition to the higher energy level. It then releases energy when falling back down to energy level 1, often observed as light.
Step-by-step explanation:
When an electron jumps from energy level 1 to energy level 3 in an atom, it absorbs energy in the form of a photon. This increase in energy allows the electron to transition to a higher energy level. Conversely, when the electron falls back down to energy level 1, it releases energy in the form of a photon. This release of energy is often observed as light.
An example of this process can be seen in the hydrogen atom. When an electron in a hydrogen atom jumps from energy level 1 to energy level 3, it absorbs a photon with a specific frequency. This absorbed energy causes the electron to transition to the higher energy level. When the electron falls back down to energy level 1, it emits a photon with a frequency corresponding to the energy difference between the two levels.