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A substance has a half life of 6,000 years.
How much of the substance will be
radioactive after a total of 12,000 years?
A. half of the original substance
B. one fourth of the original substance
C. all of the original substance
D. none of the original substance

Sagot :

Answer:

B. one fourth of the original substance

Explanation:

a substance's half life is how long it takes for half of the atoms in the substance to chemically decompose. once it's half life has been completed, it will start again with the remaining material. after 6000 years, only half of the material will remain, after 12,000 years a quarter wil remain, after 18,000 years an eighth will remain, etc.