In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life .......... $\%$
In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life .......... $\%$
- A
$69.3$
- B
$63$
- C
$50$
- D
$37$
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- [AIEEE 2012]
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