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A sample begins with 96 ng of radioactive material. How much is left after 5 half...
A 175 ng sample of radioactive material has a half life of 8.8 days. How many ng of radioactive material is left after 3 half lives? Do not put units in your answer
a radioactive material has a half life of 7 days. how many radioactive isotopes are left after 33 hours, if you had 7000000 isotopes in the beginning? Question 33 1 pts A radioactive material has a half life of 7 days. How many radioactive isotopes are left after 33 hours, if you had 7 000 000 isotopes in the beginning? Use 2 sig figs in your answer. < Previous Next >
A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 36 grams. Write an exponential equation f(t) representing this situation. (Let f be the amount of radioactive substance in grams and t be the time in minutes.) f(t) 250e 0.0087t x To the nearest minute, what is the half-life of this substance? 89 min Use the model for continuous exponential decay, y = Ao e-kt, where y is the amount of radioactive...
Part A How many half-lives must elapse until 88 % of a radioactive sample of atoms has decayed? Express your answer using two significant figures 10 AED – O @ ? Submit Request Answer Part B How many half-lives must elapse until 97 % of a radioactive sample of atoms has decayed? Express your answer using two significant figures. IVO AXP = 0e? 1/2 Submit Request Answer Provide Feedback
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
Calculate the amount of radioactive material left of a 255g sample, after 30 days, whose ½ life is 6 days.
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 X ?
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 0.0 X ?
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...