Physics
JAMB 2012
A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is
-
A.
20 seconds
-
B.
40 seconds
-
C.
80 seconds
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D.
60 seconds
Correct Answer: Option D
Explanation
1000 → 500 → 250 → 125
20 + 20 + 20 = 60s
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