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The half life of Rn-222 is 4 daysWhat was the original mass of a sample of this isotope remains after 21 hrs?
Wiki User
∙ 14y ago
The half-life on 222Rn86 is 3.8235 days. A sample of this isotope will decay to 0.8533 of its original mass after 21 hours.
AT = A0 2(-T/H)
AT = (1) 2(-21/(24*3.8235))
AT = 0.8533
Wiki User
∙ 14y ago
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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 a sample of radioisotope remains after one half-life?
One-half of the original amount. That's precisely the definition of "half-life".
What does the half life of a radioisotope represent?
It tells what fraction of a radioactive sample remains after a certain length of time.
After 36.9 years a sample of hydrogen contains one-eighth the amount it contained originally what is the half-life of the isotope?
The half-life of the isotope is 12.3.
Why After three half-lives what fraction of a radioactive sample remains?
The fraction that remains is 1/8.
What fraction of an original sample of a radio isotope remains after 3 half-life periods?
One eighth remains.
. If the half-life of an unstable isotope is 10000 years and only 18 of the radioactive parent remains in a sample how old is the sample?
30,000
How long will it take a g sample of bismuth to decay such that 2.0 g of the element remains?
You forgot to say that isotope is.
After three half-lives what fraction of a radioactive sample remains?
1/8 of the original amount remains.
What fraction of an original 20.00gram sample of nitrogen-16 remains unchanged after 36.0 seconds?
2
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.
The daughter isotope is 87.5 percent if the half-life of the isotope is 150 million years how old is the sample?
a sample is brought to the laboratory and the chemist determines the percentage of the daughter isotope is 87.5%. if the half-life of the isotope is 150 million years, how old is the sample?
After one half-life what percent of the original uranium remains?
By definition, 50%. Half life is the time for half of the original sample to decay.
Which fraction of an original 20.00-gram sample of nitrogen-16 remains unchanged after 36.0 seconds?
1/32
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.
If half life of an unstable isotope is 10000 years and only 1 8 of radioactive parent remains in a sample how old is the sample?
30,000
If the isotope have short half lives is that mean that the isotope is in a stable condition?
No. Only radioactive elements have half-lives, the half-life is the time that it will take for half of the atoms in a sample of a radioactive isotope to decay into another element or isotope. This is a constant property of the isotope and does not depend on the sample size. Stable isotopes never decay.
