Biology, 29.11.2021 22:30 shadenShaden2037

Exercices S'entraîner
EX
ET
1 Age d'une momie
proportion ratomes de carbone 16 restants
par rapport au nombre d'atomes de carbon
Une momie a été découverte en Egypte dans la vallée des Rois. de départ
On réalise une datation au carbone 14. Cet élément radioactit,
produit en continu dans l'atmosphère terrestre, reste en 08
proportion constante dans les organismes vivants. Le carbone 02
n'étant plus renouvelé à partir du décès. sa proportion
diminue comme l'indique le graphique ci-contre.
On mesure une baisse de 40 % de la proportion de carbone 14
03
de la momie
22
12
0.0
5 000
5000 20000 25000
temps écoule annees
1. Pourquoi le carbone 14 n'est-it plus renouvelé à partir du
décès des êtres vivants?
2. En vous aidant de la coube
cater la momie.
3. Peut-on utiliser la méthode su carbone 14 pour
dater les dinosaures se
555 milions d'an-
nées ? Pourquoi
Prepa
CONTRÔLE CONTINU

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Exercices S'entraîner
EX
ET
1 Age d'une momie
proportion ratomes de carbon...

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