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2018-02-16 - Article/Dans un journal avec peer-review - Anglais - 6 page(s)

Semay Claude , Lo Bue Francesco , Melin Soizic , Michel Francis, "c at the belfry" in Physics Education, 53, 035015

  • Edition : Institute of Physics
  • Codes CREF : Métrologie (DI2160), Enseignement des sciences exactes et naturelles (DI0131), Histoire des sciences (DI5145), Instrumentation et méthodes en physique (DI1270)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824), Didactique des Disciplines scientifiques (S805)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)
Texte intégral :

Abstract(s) :

(Anglais) In 1849, Hippolyte Fizeau determined the speed of light in a famous experiment. The idea was to measure the time taken for a pulse of light to travel between an intense light source and a mirror about 8 km away. A rotating cogwheel with 720 notches, that could be rotated at a variable speed, was used to chop the light beam and determine the flight time. In 2017, physicists and technicians of the University of Mons in Belgium reproduced the experiment with modern devices to allow members of the public to measure the speed of light themselves. The light source used was a low power laser, and the cogwheel was replaced by an electrically driven chopper, but the general spirit of Fizeau’s experiment was preserved. The exhibition was organised in the belfry of Mons, a baroque-style building classified as a UNESCO World Heritage site. The solutions found for the main problems encountered are presented here to help colleagues intending to reproduce the experiment.

Identifiants :
  • arXiv : 1805.05762
  • DOI : doi.org/10.1088/1361-6552/aaab86

Mots-clés :
  • (Anglais) Public experiment
  • (Anglais) 1849 Fizeau’s experiment