Radioactivity (safety): Given the half-lives below, which radioactive isotope would be the most dangerous to handle (highest activity per amount)? Assume equal initial amounts; shorter half-life ⇒ greater activity. Choose the correct option.

Concept/ApproachActivity A ∝ λ (decay constant), and λ = ln2 / T_½. Thus, for the same number of nuclei, shorter half-life means higher activity and greater handling hazard.

ComparisonT_½ = 0.01 min (≈0.6 s) ≪ 13 days ≪ 100 years ≪ 3 billion years.

Final Answer0.01 minute