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Question

The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is
  1. loge2/5
  2. 5loge2
  3. 5 log102
  4. 5 loge2

A
5 loge2
B
loge2/5
C
5loge2
D
5 log102
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