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If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?
This depends on the type of material. Uranium-238's half-life is 4,438,000,000 years. But the half-life of a material such as Radon-218 is only 35 ms. There is a great range of half-lives for a wide variety of isotopes, so it is impossible to generalize. If you're asking what a half-life is, it is the amount of time it takes for half of any quantity of a radioactive isotope to decay. So if you had a 10g pile of Uranium-238, after 4,438,000,000 years, only 5g of it would still be Uranium-238. The other half would've decayed.
How many half-lives have passed if 12.5 of a radioactive sample are left?
3 At the end of the first half life, there will theoretically be 50% remaining. 2 half lives: 25% 3 half lives:12.5 %
What scientific test can you use to work out the age of an object?
scientists can determine the age of somthing by finding out how much carbin 14 there is left in the sample. the reason fro using carbon 14 is because it has a very predictable half life of 5730(plus or minus 40) years. half life is the decay rate of certain materials. by knowing the begging amount of carbon 14 present in the sample they can determine by the amount left how old it is.this is a pretty easy subject to look up if you have any pther questions.
How much potassium-40 would remain after three half lives?
Potassium 40 is an isotope with 19 protons (and electrons) and 21 neutrons. Potassium 40 accounts for around 0.012% of potassium and is fairly stable (half life of 1.25 billion years).Potassium 40 is an isotope with 19 protons (and electrons) and 21 neutrons. Potassium 40 accounts for around 0.012% of potassium and is fairly stable (half life of 1.25 billion years).Potassium 40 is an isotope with 19 protons (and electrons) and 21 neutrons. Potassium 40 accounts for around 0.012% of potassium and is fairly stable (half life of 1.25 billion years).Potassium 40 is an isotope with 19 protons (and electrons) and 21 neutrons. Potassium 40 accounts for around 0.012% of potassium and is fairly stable (half life of 1.25 billion years).
Wagonium-292 has a half-life of 1 hour If you started with an 80 gram sample how much Wagonium-292 will remain after 4 hours?
you would have 5 g of Wagonium-292
What is the half of a radioisotope if a 100 g sample becomes 50 g after 20 years?
20
What is the half life of a radioisotope if a 100g sample becomes 50 g after 20 years?
20 years (APEX)
What is the half life of a radioisotope if a 100g sample becomes 25g after 18 years?
The half-life of the radioisotope is 9 years. This is calculated by determining the time it took for half of the original sample to decay. Since the sample went from 100g to 25g in 18 years, it lost 75g in that time period. After the first half-life, the sample would have 50g remaining, and after the second half-life, it would have 25g remaining.
What is the half-life of a radioisotope if a 40g sample becomes 10g after 20 minutes'?
The half-life of the radioisotope is 20 minutes. This means that in 20 minutes, half of the original sample (20g) remains. Therefore, if a 40g sample becomes 10g after 20 minutes, it has undergone 1 half-life.
What is the half life of a radioisotope if a 100 g sample becomes 50 g after 20 years?
20 years
What is half life of a radioisotope if a g sample becomes g after 16 hours?
16 hours.
What is the half life of a radioisotope if a 50 sample becomes 25 after 18 days?
18 days
What is the half life of a radioisotope if a g sample becomes 5 g after 2 days?
1
What is the half-life of a radioisotope if a g sample becomes g after 16 hours?
16 hours.
What is the half life of the Radioisotope H3?
The half-life of the radioisotope tritium (H-3) is about 12.32 years. This means that it takes approximately 12.32 years for half of a sample of tritium to decay into helium-3.
What is the half-life of a radioisotope if a 20-g sample becomes 10-g after 16 hours?
16 hours.
What is the half-life of a radioisotope if a 100 g sample 50 g after 20 years?
It would be 20 years. That is the length of time to lose one half the isotope.
