After 2 half-lives have passed, what % of the original
radioactive isotope remains?
After 2 half-lives have passed, what % of the original radioactive isotope remains?
1. 1. Iodine-131 is a radioactive isotope. After 8.00 days, 50.2% of a sample of 131I remains. What is the half-life of 131I? 2. The half-lives of different radioisotopes are given in the table below. If the initial amount of potassium-44 is 9.2 g, how much potassium-44 is left in the body after 44 minutes? 2. 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 59.9 g of 32P, how much 32P was present...
Find the remaining mass of a radioactive isotope after 3 half lives. The initial mass of the material was 100g.
You have 86.237g of a radioactive element with a half-life of 43.91minutes. After 3.09 half-lives have passed, how many grams of the radioactive element remain? Report your answer to 2 decimal places.
You have 82.173g of a radioactive element with a half-life of 53.39minutes. After 4.05 half-lives have passed, how many grams of the radioactive element remain? Report your answer to 2 decimal places. Answer 4.96
A 100-mg sample of a radioactive isotope is obtained. After 33.5 minutes, only 3.10 mg remains. What is the half-life of the isotope? min
after three half lives of sn isotope , 1 billion of the original isotopes Adams still remain in a certain amount of this element how many atoms of the daughter product would you expect to be present
If the half-life of a radioactive isotope is 32 days, how many half-lives must pass before a 3000mg sample is less than 0.03g? 05 O 2 07 More information is needed. 9
4. The radioactive isotope 55Fe has a half-life of 2.73 years. (a) What is the rate constant for this first-order reaction? (b)What fraction of the isotope remains after 1 years? Assume 3 significant figures in your calculations
how many half lives does it take for a radioactive isotope to reach 1/5 its initial number?
All radioactive decay processes follow first-order kinetics. The half-life of a gamma producing radioactive isotope is 2.4 hours. This isotope is used in a medical scan and enough of the isotope is given such that a heart scan can be done? If 0.75 ng of the isotope is administered, how ng of the isotope remains in the patient after 3.5 days?