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Potassium-40 (K-40) decays into argon-40 (Ar-40). After 1.25 billion years, 20 grams of K-40 would be reduced to 10 grams. How much of the original K-40 would remain after 5 bil…

Potassium-40 (K-40) decays into argon-40 (Ar-40). After 1.25 billion years, 20 grams of K-40 would be reduced to 10 grams. How much of the original K-40 would remain after 5 bil…
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Potassium-40 (K-40) decays into argon-40 (Ar-40). After 1.25 billion years, 20 grams of K-40 would be reduced to 10 grams. How much of the original K-40 would remain after 5 billion years?

A. 0 grams
B. 1.25 grams
C. 2.5 grams
D. 5 grams

User NSSplendid
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2 Answers

1 vote

the answer is B. 1.25 grams

User Alex North
by
7.9k points
5 votes

B. 1.25 grams :))))))))))))

User Avalanche
by
8.4k points
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