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What fraction of a radioactive sample decays after three half lives?
If I take a radioactive sample of 400 moles of an unknown substance and let it decay to the point of three half-lives I would have 50 moles left of the sample. 1/2 of what is left will decay in the next half-life. At the end of that half-life I will have 25 moles left of the unknown substance or 4/25.
How much of the radioactive element will be left one billion years from now?
That depends on the "half-life" of that particular radioactive element, which the question forgot to state. They're all different. Various radioactive elements have half-lives ranging from microseconds to millions of years.
What fraction of the radioactive atoms currently present will be left after four minutes if a sample of gas has a half life of two minutes?
After two minutes, half of the radioactive atoms will remain. After another two minutes, half of the remaining atoms will decay, leaving 1/4 of the original amount. Therefore, 1/4 of the radioactive atoms will be left after four minutes.
What is the half -life of most radioactive istopes?
The half-life of most radioactive isotopes ranges from fractions of a second to billions of years. Some common radioactive isotopes, like carbon-14 and uranium-238, have half-lives of thousands to millions of years, while others, like iodine-131, have half-lives of only days or even seconds.
What is the rate in halflife that radioactive decay occurs?
Half-life is the time it takes for one half of a certain type of atom (isotope) to decay. The amount of time varies a lot between different isotopes; in some cases it may be a fraction of a second, in another, it may be billions of years.
Definition of disintegration constant?
The disintegration constant is the fraction of the number of atoms of a radioactive nuclide which decay in unit time; is the symbol for the decay constant in the equation N = Noe^-t, where No is the initial number of atoms present, and N is the number of atoms present after some time (t).
What is the rate of change in a fraction?
A fraction is a numerical constant. Being a fraction does not alter that. And, as a constant, its rate of change is precisely zero.
What is the significance of a half life of a radioisotope?
It tells what fraction of a radioactive sample remains after a certain length of time.
Can a constant in a math equation be a fraction?
Yes.
What fraction of a radioactive sample remains after three half - life?
It is 1/8 .
After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
What is meant by the term the gravitational constant?
The force of gravity between two objects is proportional to(mass1) x (mass2)/(distance between them)2 , but it's not equal to that fraction. To get the actual value of the forces, youhave to multiply that fraction by a 'proportionality' constant, and since we'retalking gravity here, the constant is called the Gravitational Constant.If everything in the fraction is in SI (metric) units, then the gravitationalconstant is 6.67 x 10-11newton-meter2/kilogram2 And when you multiply the fraction by that constant, you get the actual valueof the force, in newtons.
What fraction of a radioactive nuclei remain after p half lives?
The remainder is 2-p or 0.5p of the original amount.
If a radioactive material has half a life of 10 years what fraction of the material will remain after 30 years?
There will be 1/8 remaining.
Why After three half-lives what fraction of a radioactive sample remains?
After three half-lives, only 1/8 (or 12.5%) of the original radioactive sample remains. This is because each half-life reduces the amount of radioactive material by half, so after three half-lives, you would have (1/2) * (1/2) * (1/2) = 1/8 of the original sample remaining.
Radioactive elements comprise a majority?
Radioactive elements make up a small fraction of all naturally occurring elements in Earth's crust. Most elements are stable and non-radioactive. However, even though they are a minority, radioactive elements play important roles in various scientific, medical, and industrial applications.
