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""^(226)Ra disintegrates at such a rate ...

`""^(226)Ra` disintegrates at such a rate that after 3160 years, only one fourth of its original amount remains . The half life of `""^(226)Ra` will be

A

790 years

B

3160 years

C

1580 years

D

6230 years

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The correct Answer is:
c
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