What are spectrographs used for?

When salt is dropped onto a flame, it releases a yellow flame. This color is caused by the sodium in the salt, specifically by the precise electron jump that releases the same color every time—a kind of distinctive signature for the sodium.

The spectrograph is a device that examines a star's "indistinct" light to determine what colors are present in it.

We will be able to determine that there is a specific amount of sodium present on that star if, for instance, it picks up the yellow color associated with sodium.

The spectrograph detects the unique color of each element. The spectrum of a source is the collection of colors generated by the source, which is why the device is called a spectrograph.

Spectrographs are widely used in astronomy, chemistry, and physics research to analyze the spectrum of light emitted or absorbed by an object and provide information about its chemical composition, temperature, density, and motion.

Spectrographs are used for analyzing the properties of light, including its intensity, wavelength, and frequency. They are commonly employed in various fields such as astronomy, chemistry, physics, and environmental science. Spectrographs can provide valuable information about the composition, temperature, density, and motion of celestial objects, chemical substances, and materials. Additionally, they are used in the study of atomic and molecular spectra, helping scientists understand the fundamental properties of matter and the universe.