chemistry

posted by .

The half life of gold-197 is 10.6. What fraction of a sample remains after 21.2 years?

  • chemistry -

    amount remaining=Original e^(-ln2*21.1/10.6)

    amount remaining/original=.252 check that

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years?
  2. chemistry

    the half-life of polonium-218 is 3.0 minutes. what percentage of the original sample remains after 4 half-lives?
  3. chemistry

    a radioactive material is undergoing nuclear decay. After 40 minutes, 25% of the sample remains. What is the half-life of the sample
  4. chemistry

    What percent of the original sample of strontium-90 (half-life = 28.9 years) will remain after the following time periods?
  5. chemistry

    an original sample of K-40 has a mass of 25.00 grams. After 3.9x 10 to the ninth years, 3.125 grams of the original sample remains unchanged. What is the half-life ok K-40 in minutes?
  6. Chemistry

    After 1.78 years, 1.990 g of a radioisotope remains from a sample that had an original mass of 2.000 g. Calculate the half-life of the isotope.
  7. Chemistry

    the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years
  8. Chemistry

    The half-life of 131I is 8.021 days. What fraction of a sample of 131I remains after 24.063 days?
  9. Chemistry - Radioactivity

    The activity of a sample of Ba-137m has decreased by 75% from its initial activity after 5.10 minutes. What is the half-life of Ba-137m?
  10. College algerba

    The​ half-life of a certain radioactive element is about 1500 years. After 2800 ​years, what percentage P of a sample of this element​ remains?

More Similar Questions