light

The light of the stars: spectra and information

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La lumière des étoiles : spectres et informations

IN BRIEF Light spectra: Analysis of the light emitted by stars. Decomposition of white light via a prism or a grating. Absorption spectrum: Presence of dark lines, indicating chemical elements. Hydrogen: Identification by its specific emission lines. Visible colors: Observations ranging from violet to red. Emission lines: Allow identification of elements present in stars. Importance … Read more

Understanding light and its properties in physics

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Comprendre la lumière et ses propriétés en physique

IN BRIEF Nature of light: form of visible electromagnetic energy. Visible spectrum: red (longest wavelength) to violet (shortest wavelength). White light: polychromatic, containing different radiations. Propagation: movement of energy without transportation of matter. Physical phenomenon: behaviors of waves and particles. Thermal exchanges: objects emit according to their temperature. Light is a fascinating phenomenon that plays … Read more