A concentration is:
A half life is either:
As a concentration is a fixed property, your question is meaningless and can not be answered.
After 2 half-lives, you would have 25% of the original amount remaining. Each half-life reduces the amount by half, so after two half-lives, you would have 25% left (50% reduced by half twice).
After 2 half-lives (two half-lives of tritium is 12.32 x 2 = 24.64 years), the initial 10g sample of tritium would have decayed by half to 5g.
6.5 half-lives.
91.16% of the daughter product has formed after 3.5 half lives.
After 2 half-lives, 25% of the original amount of thorium-234 will remain. This is because half of the substance decays in each half-life period.
How the Other Half Lives was created in 1890.
How the Other Half Lives was created in 1890.
To determine how many half-lives have passed, you would need to divide the total time passed by the half-life of the substance. The result would give you the number of half-lives that have occurred.
After 2 half-lives, you would have 25% of the original amount remaining. Each half-life reduces the amount by half, so after two half-lives, you would have 25% left (50% reduced by half twice).
To find out how many 14.0-day half-lives occur in 84.0 days, you can divide the total time by the length of one half-life. So, 84.0 days ÷ 14.0 days/half-life = 6 half-lives. Therefore, there are 6 half-lives in 84.0 days.
3 At the end of the first half life, there will theoretically be 50% remaining. 2 half lives: 25% 3 half lives:12.5 %
After 2 half-lives (two half-lives of tritium is 12.32 x 2 = 24.64 years), the initial 10g sample of tritium would have decayed by half to 5g.
Jacob Riis' book, How the Other Half Lives
Two half-lives refer to two complete cycles of decay in a substance, where each half-life is the time it takes for half of the original amount to decay. Thus, the total time for two half-lives is simply twice the duration of one half-life. For example, if one half-life is 5 years, then two half-lives would equal 10 years.
6.5 half-lives.
After two half lives, 25% of the original carbon-14 would remain. This is because half of the remaining carbon-14 decays during each half life, leaving you with 50% after one half life and 25% after two half lives.
91.16% of the daughter product has formed after 3.5 half lives.