Earth Science

posted by .

How long will it take for Potassium to have a 25% of oringinal radioactive product left?

  • Earth Science -

    Which isotope? What is the half life?


    In two halflifes, 25percent will remain.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Earth science

    How long an exposure would a photographer need to photograph star trails that are complete circles?
  2. chemistry

    use logic and simple math to determine how long it will take for a sample of potassium- 42 to decay from 8mg to 0.25mg if the half-life of this radioactive isotope is 124 hours
  3. Science

    If a radioactive isotope has half life of 5 days,how long will it take for its radioactive strength to be a maximum of one thousandth,(1/1000) of its original value?
  4. Science

    If a radioactive isotope has half life of 5 days,how long will it take for its radioactive strength to be a maximum of one thousandth,(1/1000) of its original value?
  5. earth

    how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left?
  6. phys

    Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei, which have a half-life of 1.26 billion years. What fraction of all the potassium nuclei in your body will …
  7. Science- Radioactive Dating

    Which of the following statements about radioactive dating is true?
  8. 8th Grade Earth Science Help?

    Which of the following terms refers to the time it takes for one-half of the radioactive atoms in a sample of a radioactive element to decay?
  9. Science

    How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior?
  10. chem

    a) Potassium-40 undergoes three different modes of radioactive decay (Beta decay, Positron decay, and Electron Capture decay). Write balanced nuclear reactions for each of these decay modes. Are the products stable (not radioactive)?

More Similar Questions