After the first half-life, you will have one half of the starting amount. After a second half-life period, you'll be down to one quarter.
Of the part that radioactively decays, about 11% of it will decay to 40Ar, and the remainder to 40Ca.
Of your total sample of ordinary potassium, only 0.012% will be 40K. The half-life of 40K is about 1.3x109 years.
Thorium-234 has a half-life of 24.1 days. How much of a 100-g sample of thorium-234 will be unchanged after 48.2 days?
According to the Handbook of tropical residual soils(Huat et al, 2012), it's a 100mm diameter sample up to 450 mm long, obtained with the British U100, which is an open-driver sampler that produces samples with much higher quality than the SPT.
The characteristic that depends on the amount of matter in a sample is its mass. Mass is a measure of the amount of matter in an object or substance, and it can change depending on how much of the substance is present.
After 6 years, approximately 5 grams of cesium-137 would remain from a 10 g sample due to its half-life of around 30 years. This decay is exponential, with about half of the original sample decaying every 30 years.
11/4 g apex
2.66666666666667 grams
3,375 days
That would depend on the initial amount of the substance, as well as on its half-life.
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1/16 of the original sample of any unstable element remains after 4 half lives.
It is the difference between sand running out of an hour glass and determining what time it is by how much sand is left. Radioactive decay happens at a steady rate. If you can determine how much of that radioactive isotope ought to have been in a sample at the start and you can measure how much is left, you can tell how much time has passed.
Hi, Each half-life means the mass of the sample has decreased by 1/2 its mass. Thus; After 1 half-life, 1/2 the sample has decayed. After 2 half-lives 3/4 of the sample has decayed. Hope this helps.
Depends on what the sample is and how much of it you have.
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
After 32 days, approximately 5 milligrams of the 80-milligram sample of Iodine-131 would be left. Iodine-131 has a half-life of about 8 days, so after each 8-day period, half of the remaining sample will decay.
This would depend on the specific sample and its stability. Without additional information, it is not possible to determine how much of the sample would remain unchanged after two hours.
The answer depends on the underlying variance (standard deviation) in the population, the size of the sample and the procedure used to select the sample.