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In a time equal to two half-lives of a radioactive isotope would you expect all of that isotope to have decayed?
No. In two half-lives, a radioactive isotope will decay to one quarter of its original mass. In one half-life, one half of the mass decays. In the next half-life, one half of the remaining mass decays, and so on and so forth. At each half-life point, you would see 0.5, 0.25, 0.125, 0.0625, etc. remaining. The logarithmic equation is... AT = A0 2(-T/H)
The half life of iron 59 is 44.5 days how much of 2mg sample will remain after 133.5 days?
After 133.5 days, there will be 0.125 mg of the 2 mg sample of iron-59 remaining. This can be calculated by taking into account each half-life period (44.5 days) and calculating the remaining amount after 3 half-lives (133.5 days).
How long would you have to wait for the mass to decrease to 25 grams if a radioactive element has a half-life of 2000 years and the sample of the element begins with a mass of 100 grams?
You would have to wait for 2000 years for the mass to decrease to 50 grams (one half-life) and another 2000 years to decrease to 25 grams (two half-lives). So, in total, you would have to wait 4000 years for the mass to decrease to 25 grams.
The half-life of a certain radioactive isotope is 12 hours If you start out with 10 g of the isotope after 1 day there will be?
If you take one day equal to 24 hours, then 1 day constitutes 2 Half lives. Mass of isotope left after 12 hours=10/2=5g Mass of isotope left after 2 half lives or 1 day=5/2=2.5g.
If half lives is 1 and time elasped is 1620 year what is mass remaining?
Half life has unit. That is unit of time. So it has to be mentioned. Let us assume that half life is 1 year. Okay. Now to know about the mass remaining we have to get the ratio (1/2)^1620. Hence remaining will be 1/(2^1620) * mass at the beginning
If 0.0463 g of a radioisotope remained after five half-lives then the original mass was g?
1.48 * If 0.0105 g of a radioisotope remained after six half-lives, then the original mass was 0.672g.
If .0463 g of a radioisotope remained after five half lives then the original mass was how many grams?
.0463g*25 =1.4816g
How long a star lives and what is becomes at the end of its life depends primarily on what?
I think it´s mass.
What is the original mass of 12.5 mg after 3 half lives?
After 3 half-lives, the remaining mass is ( \frac{1}{8} ) of the original mass. So if the original mass is 12.5 mg, the final mass after 3 half-lives would be ( 12.5 , \text{mg} \times \frac{1}{8} = 1.56 , \text{mg} ).
If 0.233 g of a radioisotope remained after four half lives then the original mass was g?
The original mass was 3.728 g. Each half-life reduces the mass by half, so after four half-lives, ( \left( \frac {1}{2} \right)^4 = \frac{1}{16} ) of the original mass remains. Therefore, the original mass can be calculated as 0.233 g * 16 = 3.728 g.
If 0.233 g of a radioisotope remained after four half-lives then the original mass was g?
3.79
If 0.0105 g of a radioisotope remained after six half lives then the original mass was g?
0.672
A radioactive element has a half-life of 1000 years. If a sample of this element begins with a mass of 20 grams how long would you have to wait for the mass to decrease to 5 grams?
Since the element has a half-life of 1000 years, it will take two half-lives for the mass to decrease to 5 grams from 20 grams. Two half-lives equal 2000 years, so you would have to wait 2000 years for the mass to decrease to 5 grams.
That shows the amount of parent material of a radioactive element that is left after four half-lives if the original parent material had a mass of 100 g.?
After four half-lives, the amount of parent material remaining can be calculated using the formula ( \text{Remaining mass} = \text{Initial mass} \times \left(\frac{1}{2}\right)^n ), where ( n ) is the number of half-lives. For an initial mass of 100 g, after four half-lives, the calculation is ( 100 , \text{g} \times \left(\frac{1}{2}\right)^4 = 100 , \text{g} \times \frac{1}{16} = 6.25 , \text{g} ). Thus, 6.25 g of the parent material remains after four half-lives.
A sample of a radioactive element has a mass of 80 g. How much parent and daughter materials are in the sample after two half-lives?
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
A radionuclide has a half-life of 1.5 years if you have a 4.00 sample of this radionuclide today how many grams would you expect to have in 9 years?
A radioactive substance halves in size and activity after every period of time that is defined as its half-life, decaying into its constituent products. Therefore, the mass of the radioactive substance after x half-lives is as follows:Mass = 0.5x x original mass.Using this formula, the original mass is 4.00g and the number of half-lives is 6 (9/1.5 = 6). We therefore have a mass of 4 x 0.56 g, which is equivalent to 1/16 of a gram.
Why is it called half-life of an atom?
The half-life of an atom is how long it takes for half of the atom's mass to radioactively decay. This occurs exponentially; therefore, after 2 of the atom's half-lives have passed, 3/4 of the atom will have decay (half during the first half-life, then half of the remaining mass, or one quarter, during the second).
