After two half-lives, half of the remaining half will decay, leaving one-quarter of the original radioactive parent atoms. Those transformed atoms bring the tally of daughter atoms to three-quarters of the crop of parent plus daughter atoms.
Q. How many half-lives does it take to reach 75 daughter isotopes?
two half-lives
Table of Contents
- Q. How many half-lives does it take to reach 75 daughter isotopes?
- Q. How long will it take for 75% of the carbon 14 atoms in a biological sample to decay to nitrogen 14?
- Q. How long does it take for an isotope to decay?
- Q. How much of the parent isotope would be remaining after 7 half-lives have passed?
- Q. What percent of a parent isotopes remains after 1 half lives?
- Q. What percent of radioactive 87rb will still be present after two half lives have passed?
- Q. How long will it take until only 25 percent of the strontium 90 remains?
- Q. What percentage of original radioactive atoms is left after five half-lives a 0.3% B 1% C 31%?
- Q. What percentage of a sample original radioactivity remains after five half-lives?
- Q. What percentage of a radioactive sample remains after 5 half-lives?
- Q. What percentage is 5 half-lives?
- Q. How much of a material remains after 5 half-lives?
- Q. What percentage of radioactive is left?
- Q. What mass of radioactive isotope is left after three half lives?
- Q. How much of the isotope will you have left after 10 years?
- Q. What is the half-life of a radioactive isotope?
- Q. What is the exact half-life of isotope A?
- Q. What percent of iodine is left if 5 half lives have passed?
- Q. Which drug has the longest half-life?
- Q. How many half-lives does it take to clear a drug?
- Q. How do half-lives work?
Q. How long will it take for 75% of the carbon 14 atoms in a biological sample to decay to nitrogen 14?
It takes 5730 years for cargon-14 to decay to nitrogen-14.
Q. How long does it take for an isotope to decay?
The half-life is the time it takes for half of a given amount of an isotope to decay. For example, the half-life of carbon-14 is 5,730 years. Imagine that you start out with 100 grams of carbon-14. In 5,730 years, half of it decays.
Q. How much of the parent isotope would be remaining after 7 half-lives have passed?
7.8125 g
Q. What percent of a parent isotopes remains after 1 half lives?
At the end of one half-life, 50% of the atoms are parent and 50% are daughter. Suppose that there are 64 million parent isotope atoms at the beginning of decay.
Q. What percent of radioactive 87rb will still be present after two half lives have passed?
The half-life of a radioactive isotope is the average length of time in which 50% of a sample of the substance undergoes radioactive decay. The original substance is callled the parent isotope and the decay product is the daughter isotope. Since 25% of the Rubidium-87 remains, approximately two half-lives have passed.
Q. How long will it take until only 25 percent of the strontium 90 remains?
It takes 28.8 years for half of the strontium to decay to 50 grams. This is called one half-life. After 28.8 more years, strontium-90 has decayed to 25 grams. This is called two half-lives.
Q. What percentage of original radioactive atoms is left after five half-lives a 0.3% B 1% C 31%?
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%.
Q. What percentage of a sample original radioactivity remains after five half-lives?
After 5 half-lives there will be 3.125% of the original isotope, and 96.875% of the decay product.
Q. What percentage of a radioactive sample remains after 5 half-lives?
Thus a first-order chemical reaction is 97% complete after 5 half-lives and 100% complete after 10 half-lives.
Q. What percentage is 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 |
Q. How much of a material remains after 5 half-lives?
The percentage of quantity of a radioactive material that remains after 5 half-lives will be . Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams. ∴NN0×100=10032=3.125.
Q. What percentage of radioactive is left?
The correct option is (A) 3%.
Q. What mass of radioactive isotope is left after three half lives?
11.25 mg
Q. How much of the isotope will you have left after 10 years?
So, the mentioned radioactive isotope after 10 years will have (100/2 = 50.0 g).
Q. What is the half-life of a radioactive isotope?
The half-life of a radioactive isotope is the time taken for half the unstable nuclei in a sample to decay.
Q. What is the exact half-life of isotope A?
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope….11.2: Half-Life.
| Isotope | Life |
|---|---|
| 248Bk | 23.7 h |
| 260Sg | 4 ms |
Q. What percent of iodine is left if 5 half lives have passed?
96.875%
Q. Which drug has the longest half-life?
However, there are numerous other drugs with very long half-life, examples are mefloquine 14–41 days (25), amiodarone 21–78 days (26), and oritavancin 393 h (27). Furthermore, what can be called “long half-life” is always relative to the length of the sampling period.
Q. How many half-lives does it take to clear a drug?
Even further, 94 to 97% of a drug will have been eliminated after 4 to 5 half-lives. Thus, it follows that after 4 to 5 half-lives, the plasma concentrations of a given drug will be below a clinically relevant concentration and thus will be considered eliminated.
Q. How do half-lives work?
Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive …
