Emission spectrum

Definition

An emission spectrum is the spectrum of light released from excited atoms as they return to a lower energy state. It appears as a series of bright lines on a dark background, each representing a specific wavelength emitted by the substance.

5 Must Know Facts For Your Next Test

1. Emission spectra are unique to each element, acting like a fingerprint for identifying substances.
2. The Balmer series in hydrogen's emission spectrum is visible in the optical range.
3. Emission spectra result from electrons transitioning between energy levels and emitting photons.
4. They are crucial for determining the composition of stars and other celestial objects.
5. Spectrographs are instruments used to observe emission spectra in astronomical studies.

Review Questions

Related terms

Absorption Spectrum:

A spectrum that shows dark lines or bands due to absorption of specific wavelengths by a substance.

Spectroscopy:

The study of the interaction between matter and electromagnetic radiation, often used to analyze spectral lines.

Photon:

A particle representing a quantum of light or other electromagnetic radiation, which carries energy proportional to its wavelength.