Definición de Fraunhofer, Joseph von en inglés:

Fraunhofer, Joseph von

Saltos de línea: Jo¦seph von Fraun|hof¦er
Pronunciación: /ˈfraʊnˌhəʊfə
 
, ˈfraʊnˌhoːfɐ/
  • (1787–1826), German optician and pioneer in spectroscopy. He observed and mapped the dark lines in the solar spectrum ( Fraunhofer lines) which result from the absorption of particular frequencies of light by elements present in the outer layers; these are now used to determine the chemical composition of the sun and stars.
    Más ejemplos en oraciones
    • In 1854 Stokes theorised an explanation of the Fraunhofer lines in the solar spectrum.
    • The roots of absorption spectroscopy can be traced to 1802, when the English chemist William Hyde Wollaston observed what later became known as the Fraunhofer lines - the many dark lines seen in the spectrum of sunlight.
    • We are shown clearly the bands of colors, but Rowland's more exacting analysis would spread this spectrum over sixty feet, revealing also the Fraunhofer lines: hundreds of dark lines interspersed throughout the spectrum.

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Palabra del día kerf
Pronunciación: kəːf
noun
a slit made by cutting with a saw