Jacob Riis, in 1890
Dangerous
After two half-lives, 75% of the original material has decayed.
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.
1/16 of the original sample of any unstable element remains after 4 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.
it depends on where it came from, and how old it is.
A half-life is the amount of time it takes for half of the material to decay. So if you started with 80g After 1 half-life you would have 40 g After 2 half-lives you would have 20 g After three half-lives you would have 10 g
Today, about half of all Americans live in suburbs.
2.66666666666667 grams
According to "How the Other Half Lives," buildings in slums lacked sufficient natural light due to overcrowding and narrow living spaces. This lack of light not only impacted the living conditions and health of residents but also contributed to the spread of disease and unsanitary living conditions.
To calculate the amount of thorium remaining after 2 half-lives, you use the formula: amount = initial amount * (1/2)^n, where n is the number of half-lives. If we assume the initial amount is 1 gram, after 2 half-lives, there would be 0.25 grams of thorium remaining.
By observing how much decays in a few days, or in a year, and extrapolating.