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Geography, 05.05.2020 23:24 chavez0

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Pieces of uranium-232 are discovered in a cave. If its half-life is 70 years, how many years will it take a 10 g piece of uranium-232 to be reduced to 2.50 g?
A.
70 years
B.
210 years
C.
140 years
D.
280 years

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