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Maille cubique face centré


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Posted

Bonjour, j’ai du mal à voir d’où sort le racine de 8 dans l’item B. Quelqu’un pourrait m’expliquer ?? 

Merciii

Ouvrir sujet chimie session 1 mars 2022_correction_2c474ad2538519c802aa2be06de9c3c2.png

  • Responsable Matière
  • Solution
Posted

la relation de tengence de cfc c'est a√2 = 4R

donc a = 4R/ √2

et 2/√2 =√2

donc a = 2√2R

et 2√2 =√8

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