# A radioactive substance of mass 768g has a half life of 3 years. After...

Question 975
A
21
B
18
C
15
D
12
##### Explanation
$$768 \to 384 \to 192 \to 96 \to 48 \to 24 \to 12 \to 6$$

7 x 3 = 21yrs

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