A piece of radioactive material contains 1000 a... - JAMB Physics 2012 Question
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
D
60 seconds
correct option: d
1000 → 500 → 250 → 125
20 + 20 + 20 = 60s
20 + 20 + 20 = 60s
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