Table of Contents
- 1 What portion of a radioactive sample remains after four half-lives have passed?
- 2 How many atoms will be left after 5 half-lives?
- 3 How many atoms would remain after 5 half-lives if you had a sample of 4000 radioactive atoms?
- 4 What portion of a radioactive sample remains after two half-lives?
- 5 What is a 1/2 life?
- 6 How many carbon 14 atoms are there?
- 7 What percentage of radioactive substances are original?
- 8 How many half lives have passed for 50\% of the original radioactive material remains?
What portion of a radioactive sample remains after four half-lives have passed?
10.3: Half-Life
| Number of Half-Lives Passed | Fraction Remaining | Percentage Remaining |
|---|---|---|
| 2 | 1/4 | 25 |
| 3 | 1/8 | 12.5 |
| 4 | 1/16 | 6.25 |
| 5 | 1/32 | 3.125 |
How many atoms will be left after 5 half-lives?
Half-life
| Number of half-lives elapsed | Fraction remaining | Percentage remaining |
|---|---|---|
| 3 | 1⁄8 | .5 |
| 4 | 1⁄16 | .25 |
| 5 | 1⁄32 | .125 |
| 6 | 1⁄64 | .5625 |
What percentage of a radioactive substance is left after 5 half-lives?
After the fifth half-life, it will reduce to half of the remaining concentration. Therefore, from the above explanation the correct option is (C)$3.125\\% $.
How many atoms would remain after 5 half-lives if you had a sample of 4000 radioactive atoms?
125 radioactive atoms
1. If you had a sample of 4,000 radioactive atoms, how many atoms would remain after 5 half- lives? 125 radioactive atoms.
What portion of a radioactive sample remains after two half-lives?
Explanation: After 1 half life , clearly HALF of the original isotope remains. And after TWO half-lives, a HALF + HALF of a HALF , i.e. 34 of the original mass has decayed.
How much of a radioactive sample decays in one half life?
A more precise definition of half-life is that each nucleus has a 50\% chance of living for a time equal to one half-life t1/2. Thus, if N is reasonably large, half of the original nuclei decay in a time of one half-life.
What is a 1/2 life?
Half-life (t1/2) is defined as the amount of time required for the drug concentration measured in plasma (or other biological matrices) to be reduced to exactly half of its starting concentration or amount. After IV dosing, the drug concentrations in plasma decline due to both elimination and distribution [15].
How many carbon 14 atoms are there?
Carbon-14 (14C), or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons….Carbon-14.
| General | |
|---|---|
| Protons | 6 |
| Neutrons | 8 |
| Nuclide data | |
| Natural abundance | 1 part per trillion |
What percentage of a radioactive sample remains after three half-lives?
After three half-lives 1/8 (12.5\%) of the original sample remains. A half-life is the amount of time it takes for one-half of a sample to undergo…
What percentage of radioactive substances are original?
The correct option is (A) 3\%.
How many half lives have passed for 50\% of the original radioactive material remains?
After the first half life is passed, 50\% of the original radioactive material remains (the other 50\% converted to a different element). After the second half life, only 25\% of the original radioactive material remains, and after 3 half life, 12.5\%, etc.
How many half lives have passed if 6.25 of the material remains?
2 Answers. It will take 4 half lives.