Final answer:
After 24 years, 25% of a radioactive sample of tritium would remain because the half-life of tritium is 12 years, and the sample halves every 12 years.
Step-by-step explanation:
The question is asking about the decay of a radioactive isotope, specifically tritium, over time. Based on the given half-life of tritium which is 12 years, we can calculate the remaining percentage of a radioactive sample after any given number of years.
After one half-life (12 years), 50% of the original tritium would remain. After two half-lives (24 years), this amount would halve again, which means 25% of the original sample would be left.
Therefore, after 24 years, which is double the half-life of tritium, 25% of a radioactive sample of tritium would remain.
Tritium, a radioactive isotope of hydrogen, has a half-life of 12 years. This means that after 12 years, the amount of tritium in a sample will decrease by half. So, after 24 years, two half-lives have passed, and the amount of tritium remaining will be one-fourth of the original amount. Therefore, after 24 years, 25% of the radioactive sample of tritium will remain.