A pure sample of nuclide P P\,P containing N N\,N nuclei has an activity AAA. The half-life of P P\,P is 4500 years.
A pure sample of nuclide Q Q\,Q containing 2N nuclei has an activity 8A.
What is the half-life of nuclide QQQ?
562.5 years562.5\text{ years}562.5 years
1125 years1125\text{ years}1125 years
9000 years9000\text{ years}9000 years
18000 years18000\text{ years}18000 years
