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What is the half life of a radioisotope if a 100 g sample becomes 25 g after 18 years?
Wiki User
∙ 12y ago
Verified answer
If 100 g becomes 25 g, then we are dealing with two half-lives, i.e. 50 g after one half-life, and 25 g after the second half-life. That means the half-life is nine years.
Wiki User
∙ 12y ago
Anonymous
9 years.
Wiki User
∙ 15y agoThen the 'half-life' is 50 years. * Imagine the sample was measured on 1 January 1900 - it is 100% * Fifty years later - on 1 January 1950 - it is down to 50% (Half of what was there in 1900 is now decayed.) * One hundred years after the initial measurement - on 1 January 2000 - it is down to 25% (half of what had been there in 1950 is now decayed.) ... and, in case you're wondering, on 1 January 2050 there will be 12.5% of the original sample remaining.
Wiki User
∙ 6y agoThe half life is 4.5 years.
Natalie Yettner
Ap3x is 9 years :)
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.
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
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).
What is the half life of a radioisotope if a 100g sample becomes 25g after 18 years?
9 years
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 100 g sample becomes 50 g after 20 years?
20 years
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 g after 16 hours?
16 hours.
What is the half life of a radioisotope if a g sample becomes 5 g after 2 days?
1
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 20-g sample becomes 10-g after 16 hours?
16 hours.
What is the half life of a radioisotope if a 20 g sample becomes 10 g after 16 hours?
The half-life is 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.
What does the half-life a radioisotope indicate?
The rate of decay for a radioactive sample
