Helium spectral lines

Référence de la vidéo 11936516
Spectral lines of helium. An element's spectral lines are specific wavelengths of light that it emits due to electrons transitioning between different energy levels in the atoms, emitting light of a characteristic wavelength as they move to a lower energy level. As each element has its set of levels at unique energies, the emission spectrum of an element is like a fingerprint. Helium was discovered by studying the spectrum of sunlight, where astronomers found a spectral line unknown amongst elements on Earth. This was the strong yellow line seen here, at a wavelength of 587.49 nanometres. Due to this, helium takes its name from the Greek word for the Sun.
Licence : Droits gérés
Crédit : Science Photo Library / RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA
Model Release : Non requis
Durée : 16 Secondes
Aspect ratio : 16/9
Restrictions : -

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