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The half-life period of a radioactive su...

The half-life period of a radioactive substance is 140 days. After 560 days, one gram of the element will be reduced to:

A

`(1)/(2)g`

B

`(1)/(4)g`

C

`(1)/(8)g`

D

`(1)/(16)g`

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The correct Answer is:
D
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