Calculate the amount of radioactive material left of a 255g sample, after 30 days, whose ½ life is 6 days.
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Calculate the amount of radioactive material left of a 255g sample, after 30 days, whose ½...
8. A. Calculate the amount of radioactive material left of a 255g sample, after 30 days, whose life is 6 days (12 pts) B. Write out the products of a particle decay of the Thorium nucleus below. 234 Th 90 C. True or False. In a nuclear reaction changes occur in the nucleus of the atom only.
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 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
After 1.96 days, the activity of a sample of an unknown type radioactive material has decreased to 91.2% of the initial activity. What is the half-life of this material?
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
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...
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...
A sample begins with 96 ng of radioactive material. How much is left after 5 half lives? 0 19 ng O 3.0 ng 3.8 ng 9.6 ng SUBMIT
A sample of radioactive material is initially found to have an activity of 115 decays/min. After 4 d 22 h, its activity is measured to be 63 decays/min. 1) (a) Calculate the half-life of the material.
-.161 The amount of a certain radioactive material (in grams) in a storage facility at time t is given by c(t) = 17 e where time is measured in years. (a) How much of the radioactive material was present initially? (b) What is the hall-life of the radioactive material? (Hint: For what value oft is c(t) = 8.5?) (a) Initially, there were grams of the radioactive material. (Round to two decimal places as needed.) Find the interest on the following...