What is the difference between an emission spectrum and an absorption spectrum? Please write a few sentences.

An emission spectrum and an absorption spectrum are two fundamental ways that matter interacts with light, and they are essentially the opposite of each other.

1. Emission Spectrum: This is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. In simpler terms, when an atom or molecule absorbs energy, it can jump from a lower energy level to a higher one. When it comes back down to the lower energy level, it emits light. This light can be captured and displayed as a series of colored lines on a dark background, which is known as an emission spectrum.

2. Absorption Spectrum: On the other hand, an absorption spectrum is essentially the opposite. It is the spectrum of frequencies of electromagnetic radiation that have been absorbed from a light source. This happens when a molecule or atom absorbs photons and jumps from a lower energy level to a higher one. The absorbed wavelengths of light are missing from the light that is seen, so an absorption spectrum looks like a series of dark lines on a colored background.

In summary, an emission spectrum shows the light that is emitted by atoms or molecules when they move from a high energy state to a low energy state, while an absorption spectrum shows the light that has been absorbed by atoms or molecules as they move from a low energy state to a high energy state.