If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years?...
2) Lifetime of C14 Atom The half-life time of Cl4 is 5568 years. If C14 dating was attempted for a piece of wood believed to be 2000 years old, what is the abundance of Cl4 in the wood compared to wood of the same kind which has been freshly cut from a tree?
Question 4 1 pts A particular radioactive isotope has a half-life of 2.90 weeks. What fraction of the original sample is left after 101.5 days? 1/8 1/64 1/32 1/16 none of these Next
Ch. Ex. 63- Half-life - use value and interval to calculate mass of sample remaining 5 attempts left C Check my work If 3.3 mg of the radioisotope iodine-131 is administered to a patient, how much will remain in the body after 27 days, assuming that no iodine has been eliminated from the body by any other process? (The half-life of iodine-131 is 8.1 days.) mg
The Cs-131 nuclide has a half-life of 30 years. After 120 years, 8.7 g remain. What is the original mass of the Cs-131 sample?
A radioactive sample has a half-life of 10 minutes. What fraction of the sample is left after 40 minutes ? 1/2 1/4 1/8 1/16 Which one is correct ?
Problem 11: Beryllium-7 has a half-life of 53.1 days. What fraction of the nuclei in a beryllium sample will remain after 225 days? [If it will help, you can assume that 109 nuclei are present at the start] (6)
The isotope 143Pr undergoes beta decay with a half-life of 13.57 days. What fraction of 143Pr has decayed after 11.6 days?
If carbon-14 has a decay half-life of 5730 years, what fraction of the original carbon-14 would you expect to remain intact in a 3000 year old parchment scroll, and why?
1-2 lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life of 8.0 days. 2) Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240-mol sample of radium to decay to 1.50x 10 mol? lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with...
Fluorine-21 has a half-life of approximately 5 seconds. What fraction of original nuclei would remain after 1 minute?