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3.4. Le noyau de tritium a une demie-vie t1/2 = 12 ans. Une source contient N = 6,02.10 23 noyaux de tritium à la date t = 0. Combien en contient-elle à la date t = 6 ans ? 3.5. À quel domaine des ondes électromagnétiques, la radiation émise par les lasers utilisés

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トリチウムについて. トリチウムは、「三重水素」とも呼ばれ、水をつくるために必要な「水素の仲間」で地球上のどこにで