Final answer:
The half-life of Carbon-11 (11C) is 20.334 minutes, making the correct answer (C) 20 minutes.
Step-by-step explanation:
The half-life of a radioactive isotope is the time required for the substance to reduce to half its initial amount due to radioactive decay. The isotope in question here is Carbon-11 (11C), which has a half-life of 20.334 minutes. Therefore, the correct answer is (C) 20 minutes. In practical terms, after 20 minutes, the amount of Carbon-11 will decrease to half of its original quantity. This concept is crucial in fields such as nuclear medicine and radiocarbon dating, where different isotopes have different half-lives that determine their usage and analysis.
The half-life of 11C is approximately 20 minutes. This means that after 20 minutes, half of the initial amount of 11C will decay. After another 20 minutes, half of the remaining 11C will decay, and so on.