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The half - life of radium is 6400 years ...

The half - life of radium is 6400 years . The fraction of a sample of radium that would remain undecayed after 6400 years is

A

`(1)/(2)`

B

`(1)/(4)`

C

`(1)/(8)`

D

`(1)/(16)`

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The correct Answer is:
D
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