Question

A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain

• A. 200 atoms
• B. 450 atoms
• C. 75 atoms
• D. 500 atoms

Answer 1

The correct option is C 75 atoms

$n-\frac{90}{30}-3\Rightarrow N-\frac{600}{2^3}-75atoms$.