Ask Question
5 February, 23:49

If We Start With 400 Atoms Of A Radioactive Substance, How Many Would Remain After Two Half-Lives?

+5
Answers (2)
  1. 6 February, 00:10
    0
    You basically take a half-life one at a time. The first half-live gets rid of 200 of the atoms, leaving you with 200. Then the second half life gets rid of 100 of the remaining atoms (half of the 200) leaving you with 100 atoms
  2. 6 February, 00:19
    0
    Two half-lives produce (1/2) x (1/2) = 1/4 of the decaying substance.

    There would still be 400 atoms. But 300 would have thrown off

    particles from their nucleuses, and only 100 would still be radioactive.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “If We Start With 400 Atoms Of A Radioactive Substance, How Many Would Remain After Two Half-Lives? ...” in 📗 Physics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers