December 2020 0 187 Report
Bonjour svp j'ai besoin d'aide je dois le rendre dans 1 min svpp exercice 4 :
L’année de lumière (symbole a.l) est une unité de distance qui correspond à la distance parcourue par la lumière en une année
1) Détermine la valeur de 1 a.l ( en kilomètres) .
données : 1 an = 365.25 jours - 1 jour =24h - 1h=60 min - 1min = 60s
C= 300 000 km/s = 300 000 000 m/s
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2) Pourquoi les astronomes préfèrent- ils cette unité au lieu du kilomètre pour mesurer des distances dans l’espace.
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