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The half-life of strontium-90 is 28 years. How long will it take a 76 mg sample to decay to a mass of 19 mg?
After 28 years your sample halves, ie becomes 38 mg. In another 28 years it will have halved again to 19 mg, so your answer is 56 years
It may not seem important, but you should remember that your sample is not evaporating. The actual 76 mg sample will still have almost all of its mass after 56 years. But by that time only 19 mg of it will be strontium-90. The rest of the sample will still be there, but it will have become Zirconium-90 which is stable.
What else can I help you with?
If you had a 100 gram sample of plutonium how much would remain in 43 years?
Plutonium-239 has a half-life of about 24,100 years, meaning it takes that long for half of a sample to decay. In 43 years, which is much shorter than the half-life, only a tiny fraction of the plutonium would decay. Therefore, after 43 years, approximately 99.83 grams of the original 100-gram sample would remain.
A sample of wood contains 12.5 of its original carbon -14 what is the true estimate of this sample?
Carbon-14 has a half-life of about 5,730 years. If a wood sample contains 12.5% of its original carbon-14, it has undergone four half-lives (since 100% → 50% → 25% → 12.5%). Therefore, the true age estimate of the sample is approximately 22,920 years (4 half-lives x 5,730 years per half-life).
How many years after dying does a sample lose one-half of it carbon - 14 atoms?
5730 years (approx).
How many years would it take half of the rubidium-87 atoms in piece of rock to change into strontium-87?
The half-life of rubidium-87 is approximately 48.8 billion years. This means it would take about 48.8 billion years for half of the rubidium-87 atoms in a rock sample to decay into strontium-87. Therefore, to see half of the rubidium-87 atoms change into strontium-87, you would need to wait this extensive period.
What fraction of a radium sample will remain after 3240?
The answer depends on 3240 WHAT: seconds, days, years?
How do you identify beta decay?
A sample of 187 rhenium decays to 187-omium with halflife of 41.6 billion years. If all 188 osmium are normalized isotopes.
If a half life is 2000 years will a large amount of this radioactive sample be around for a long time?
Half-life of 2000 years means that after 2000 years, half of the sample will decay - so of course the other half of the sample is still around.Half-life of 2000 years means that after 2000 years, half of the sample will decay - so of course the other half of the sample is still around.Half-life of 2000 years means that after 2000 years, half of the sample will decay - so of course the other half of the sample is still around.Half-life of 2000 years means that after 2000 years, half of the sample will decay - so of course the other half of the sample is still around.
How long will it take for three-fourths of a sample of caesium-137 to decay?
It will take two half-lives or about 60.34 years for three-fourths of a Cs-137 sample to decay.
A uranium235 sample starts with 200 atoms and 700 million years later there are 100 atoms What is the halflife of uranium235?
700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.
The half-life of isotope X is 2.0 years how many years would it take for a 4.0 mg sample of X to decay and have only 0.50 mg of it remain?
It would take 4 half-lives for a 4.0 mg sample of X to decay to 0.50 mg. Since the half-life is 2.0 years, it would take 8.0 years for this decay to occur.
How long will it take half of a radioactive sample to decay?
The time it takes for half of a radioactive sample to decay is known as the half-life. Each radioactive element has a unique half-life, which could range from fractions of a second to billions of years. The half-life remains constant regardless of the size of the initial sample.
Uranium-235 has a half life of?
The half-life is 700 million years !
If you had a 100 gram sample of plutonium how much would remain in 43 years?
Plutonium-239 has a half-life of about 24,100 years, meaning it takes that long for half of a sample to decay. In 43 years, which is much shorter than the half-life, only a tiny fraction of the plutonium would decay. Therefore, after 43 years, approximately 99.83 grams of the original 100-gram sample would remain.
How much of an 800-gram sample of potassium-40 will remain after 3.9109 years of radioactive decay?
100 grams
The half-life of strontium-90 is 28 years How long will it take a 76 mg sample to decay to a mass of 19 mg?
56 years
How many grams of a 35 gram sample of radium will decay in 5000 years if the half-life of radium is 1602 years?
To determine the amount of radium that will decay in 5000 years, we need to find the number of half-lives that occur in that time period. Since the half-life of radium is 1602 years, approximately 3 half-lives occur in 5000 years. After 3 half-lives, the initial 35g sample will decay to approximately 4.375g.
How long does it take a 100 gram sample of uranium 235 to decay to a mass of 50 gram?
700 million years
