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The half-life of radium is 1690 years. If 30 grams are present now, how much will be present in 720 years?
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2 votes
The half-life of radium is 1690 years. If 30 grams are present now, how much will be present in 720 years?

User Kkflf
by
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1 Answer

2 votes

Answer:

22.3 gm

Explanation:

720 is this many half lives : 720 / 1690

so there will be this much left 30 gm ( 1/2)^(720/1690) = 22.3 gm

User Adrian Ratnapala
by
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