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The equation for half-life is ...
AT = A0 2 (-T/H)
... where A0 is the starting activity, AT is the activity at some time T, and H is the half-life in units of T.
There are other versions, but they all work out the same way. Using this version, with 2 as the base instead of e, makes it easier to remember.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoA half life of an element is the time it takes for exactly half of it's mass to be expelled through radiation. So, for instance, the half life of a uranium atom is the time it takes for it to emit a half of it's mass as radiation. Using the half life of an atom and a given percentage of decay, you could determine the time that has passed. Take atom X, with a half life of 100 days. 40% of it has decayed from it's original mass. If 50% decays over 100 days, 40% (4/5ths of 50) will decay over 80 days (4/5th of 100).
Wiki User
∙ 14y ago1) Find number of half-life(t1/2) and Total Time(TT)
-sometimes the total time or number of half life are not given.
2) divide (TT) over (t1/2) = half-life
Wiki User
∙ 10y agoAT = A0 2 (-T/H)
Where A0 is the starting activity, AT is the ending activity, T is the time, and H is the half-life in units of T.
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How many half-lives have carbon gone through if 37245 years have passed and one half-life for carbon is 5730 years?
6.5 half-lives.
After three half lives what fraction of the daughter product has formed?
91.16% of the daughter product has formed after 3.5 half lives.
How is the half life of an isotope defined?
A half-life is the time taken for the radioactivity of a material to fall to half its original value. A material can undergo infinite half-lives because each time it falls to half the next half-life falls to half of that half: No half-lives have elapsed when radioactivity is at the original amount; 1/1. 1 half-life is when radioactivity is at 1/2 2 half-lives is when radioactivity is at 1/4. 3 half-lives is when radioactivity is at 1/8. 4 half-lives is when radioactivity is at 1/16. And so on.
Why is it beneficial that different substances have different half lives?
Isotopes have different half lives; the importance of this value depends on the specific application or problem.
How do you calculate daughter in half life?
1000 years
Why is radioactive decay measured in half lifes?
The half-life forms a type of clock used to calculate time passed.
Calculate how many half lives have passed in a rock containing one-eighth the original radioactive material and seven eighths of the of the daughter product?
1/8 = (1/2)3 which is in the form (1/2)n where n is the number of half lives undergone. Therefore the substance has passed three half lives
How The Other Half Lives was created?
How the Other Half Lives was created in 1890.
When was How the Other Half Lives created?
How the Other Half Lives was created in 1890.
What fraction of a radioactive sample remains after three half lives?
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
How many half-lives have passed?
To determine how many half-lives have passed, you would need to divide the total time passed by the half-life of the substance. The result would give you the number of half-lives that have occurred.
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 was one cause for improvements in the slums?
Jacob Riis' book, How the Other Half Lives
How many half-lives have carbon gone through if 37245 years have passed and one half-life for carbon is 5730 years?
6.5 half-lives.
After three half lives what fraction of the daughter product has formed?
91.16% of the daughter product has formed after 3.5 half lives.
How do you calculate half of a circle if the radius is 6 centimeters?
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.
Which statement is true about half-lives a Different atoms of the same element have different half-lives. b Each radioactive isotope has its own half-life. c All radioactive nuclides of an element?
The correct answer is: Half-lives are not affected by temperature.
