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Question

The radioactivity of an element becomes 164th of its original value in 60 seconds. Then the half life period of element is
  1. 5 secs
  2. 20 secs
  3. 30 secs
  4. 10 secs


Solution

The correct option is D 10 secs
2n=64n=6
T12=606=10s

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