Physics WAEC

A radioactive substance of mass 768g has a half-life of 3 years. After how many years does this substance leave only 6g undecayed?

A. 21
B. 18
C. 15
D. 12

Correct Answer: Option A

A. 21

Explanation

768→384→192→96→48→24→12→6

7 x 3 = 21yrs

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6 years ago

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