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T is the half life period and Ta is the ...

`T` is the half life period and `T_a` is the average life of a radioactive substance. Which of the following statement is correct ?

A

`TgtT_a`

B

`T` is about 69% of `T_a`

C

`T` is inversely proportional to `T_a`

D

`T` and `T_a` both are directly proportional to radioactive decay constant.

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