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In a sample of radioactive material, wha...

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

A

`63%`

B

`69.3%`

C

`37%`

D

`50%`

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The correct Answer is:
A
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NCERT FINGERTIPS-PRACTICE PAPPER-Practice Paper 3
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  16. The efficiency of a transformer is 90%. The transformer is rated for o...

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