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How much of the original sample will be left at the end of the second day if a sample of radioactive isotope has a half life of 1 day?
Wiki User
∙ 12y ago
Hi,
Each half-life means the mass of the sample has decreased by 1/2 its mass.
Thus;
After 1 half-life, 1/2 the sample has decayed.
After 2 half-lives 3/4 of the sample has decayed.
Hope this helps.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoIf a sample of a radioactive isotope has a half life of 1 day, then there will be one half of the original sample left after one day, and one quarter (one half of one half) left after two days, and one eighth (one half of one half of one half) after three days.
Wiki User
∙ 12y agoThat's two half lives. At the end of the first day, half the original material has decayed. At the end of the second day, half of what's left, or one quarter, more will have decayed.
So one quarter of the original material will be left. Note that the other three quarters is probably "still there", it'll just be a different nuclide.
Wiki User
∙ 11y agothat would depend on the halflife, which you did not give.
Wiki User
∙ 10y ago1/8
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What is the half life of radioisotope?
Half life is the time taken for approximately half of the available nuclei in a sample of radioactive material to decay into something else. It's a characteristic of the isotope, for example, the half life of the isotope of iodine, I131 is 8.08 days. Half lives can vary from fractions of a second to thousands of years.
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
What is meant by the half-life of a radioactive nuclide?
A half-life is the time it takes for half the original quantity of a given radioisotope to decay. If we are given a sample of one kind of radioactive material, the time it takes for half of it to undergo radioactive decay is the half-life of that radioisotope. It's a statistically derived figure, but scientists have arrived at some very accurate figures to denote the half-life of different radioactive isotopes.The half-life of an unstable material is a constant which is characteristic of exponential decay. This follows because at any time in the decay process the number of disintegrations per second is proportional to the number of atoms of the isotope present, and this is generally unaffected by any physical influence on the material.The half life of a radioactive isotope (radioisotope) is the amount of time required before half of the original mass of the isotope has decayed. For example, the radioisotope Uranium-238 i has a half-life of 4.46 billion years, therefore, if you have 100g of uranium-238 today in 4.46 billion years you will only have 50g.Radioactive substances undergoes decaying process by emitting alpha and beta particles from its nuclei of its own atoms. The time required to desintegrate half of the amount of a radioactive substance is its half life.
What is the formula to calculate the half-life of a radioactive isotope?
The following formula can be used to calculate half-life (t1/2):t1/2 = (t ln 1/2)/(ln mf / mi)t = time that has passedmf = the final or remaining mass of undecayed samplemi = the initial or original mass of undecayed sample(The fraction mf / mi is of course equivalent to the fraction of undecayed sample remaining, in case you are given the fraction remaining rather than specific masses.)Note: You can also use base-10 logarithms instead of natural logarithms.The half-lives of radioactive isotopes vary between a tiny fraction of a second, and more than 1015 years.(see related link to a list of half-lifes)
What is a radioactive element's half-life?
The time it takes for a half of the element to decay. In Example: Technetium-99 has a half life of 6 hours. If you begin with a sample of 100g, then after 6 hours you will have 50 grams, at 12 hours you will have 25 grams and so on; however it will NEVER reach 0 (it will remain in exponentially small ammounts because of the asymptote in the graph). This specific exponential decay is shown by the equation y=100(0.5)((1/6)x)
Compared to the length of time for the first half-life of a sample of a radioactive isotope the length of time for the second half-life is?
the same
What is the half life of radioisotope?
Half life is the time taken for approximately half of the available nuclei in a sample of radioactive material to decay into something else. It's a characteristic of the isotope, for example, the half life of the isotope of iodine, I131 is 8.08 days. Half lives can vary from fractions of a second to thousands of years.
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
How much of an original isotope remains at the end of a second half-life?
One quarter.
What fraction of a radioactive sample remains after one half-life?
Half of the original sample of a radio isotope remains after a half-life period. After two half-life periods, one-fourth of the radio isotope remains.
What is meant by the half-life of a radioactive nuclide?
A half-life is the time it takes for half the original quantity of a given radioisotope to decay. If we are given a sample of one kind of radioactive material, the time it takes for half of it to undergo radioactive decay is the half-life of that radioisotope. It's a statistically derived figure, but scientists have arrived at some very accurate figures to denote the half-life of different radioactive isotopes.The half-life of an unstable material is a constant which is characteristic of exponential decay. This follows because at any time in the decay process the number of disintegrations per second is proportional to the number of atoms of the isotope present, and this is generally unaffected by any physical influence on the material.The half life of a radioactive isotope (radioisotope) is the amount of time required before half of the original mass of the isotope has decayed. For example, the radioisotope Uranium-238 i has a half-life of 4.46 billion years, therefore, if you have 100g of uranium-238 today in 4.46 billion years you will only have 50g.Radioactive substances undergoes decaying process by emitting alpha and beta particles from its nuclei of its own atoms. The time required to desintegrate half of the amount of a radioactive substance is its half life.
What is the average atomic mass of an element is the average atomic masses of what kind of isotopes?
average atomic massof an element=(Atomic mass of first isotope X % of that isotope) + (Atomic mass of second isotope X % of the second isotope)
What is the percentage of radioactive nuclei left after 3 half lives have passed?
12.5%
What is the length of time it takes for one half of the nuclei of a radioactive isotope to decay?
It can vary from tiny fractions of a second to several sextillion years.
Why are some of the atomic weights on the periodic table whole numbers within parenthesis?
Elements that have their atomic weights in parentheses are unstable and radioactive, some of these will decay in less than a second. The atomic mass in the parentheses is the most stable isotope of the element.
What is the second isotope of hydrogen?
Deuterium, it has 1 neutron and one proton.
At the second grade level what are radium and polonium?
radioactive elements
