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The number of atoms of a radioactive sub...

The number of atoms of a radioactive substance of half-life T is `N_(0)` at t= 0. The time necessary to decay from `N_(0)//2` atoms to `N_(0)//10` atoms will be

A

`(5)/(2)T`

B

T ln 5

C

`T ln ((5)/(2))`

D

`T (ln 5)/(ln 2)`

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