A radio-isotope has a half- life of $5$ years. The fraction of the atoms of this material that would decay in $15$ years will be
A radio-isotope has a half- life of $5$ years. The fraction of the atoms of this material that would decay in $15$ years will be
- A
$1/8$
- B
$2/3$
- C
$7/8$
- D
$5/8$
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- [AIPMT 2012]
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