Use the following half-life graph to answer the question: What is the mass of the radioactive isotope remaining at 2.0 minutes? 50.0 mg 25.0 mg 12.5 mg • 6.25 mg Mass Remaining (mg) 60.0 50.0 40.0 30.0 20.0 10.0 0.0 0.0 Half-Life Graph of a Radioactive Isotope 1.0 2.0 3.0 Time (minutes) 4.0 5.0 6.0
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- The half-life of a radioactive isotope is known to be exactly 1 h. a) What fraction of a sample would be left after exactly 3 h? % Remaining = b) What fraction of a sample would be left after exactly 1 day? % Remaining =When a plant or animal dies, its 14C content decreases with a half-life of t¹/2 = 5730 years. If an archaeologist find an ancient fire-pit containing partially consumed firewood and the 14C content of the wood is 15% of what it would be for a similar carbon sample from a present day tree, what is the approximate age of the ancient site? 24.96.91.88 Enter your numerical result below, in units of years. Aim for a precision of 2 significant figures. Your Answer: AnswerThe half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 6.1*10^3 Bq. The activity in a similar-sized sample of fresh wood is measured to be 6.9*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.
- 10. The radioactive isotope (82Sr) has a half-life of 25.4 days. A sample containing this isotope has an initial activity at (t = 0) of 4.50 × 108 Bq. Calculate the number of nuclei that will decay in the time interval between t₁ = 80.0 hours. for ssi nuclei ssf624 50 ssfo 30.0 hours and t2 sf60 s 60 ssf68. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock specimen that contains sixty percent of its original number of radioactive atoms. years 0 ssi sf60 ss” 50 ssf6€ ssf60 sta £60A radioactive sample is prepared; 10.78 hours later, only 1/16th of the original sample remains. What is the half-life of this radioactive sample in hours? Round to one decimal place.
- d) Below is a decay curve for iodine-131. This is used in the treatment of thyroid cancer. Radioactive iodine should not remain in the body at high levels. A safe amount is 2 g of iodine-131 remaining in the body after 24 days. Considering the decay rate, use the graph below to work out the largest safe mass of iodine-131 that should be used for treatment?QUESTION 15 Supposed that a radioactive substance has decayed until only of 1/8 of it remains. How many half-lives passed in the process? 2Answer the following questions regarding the radioactive isotope radium-226. A.Write a nuclear equation for when this nucleus undergoes beta decay. B.What is the binding energy of a radium-226 nucleus? The mass of radium-226 is 226.02541 amu. C.A rock obtained by geologists was found to obtain 1.38 mg of radium-226. Later studies confirmed that 922 years prior, the rock contained 34.6 mg of radium-226. How many half-lives have elapsed? D.Based on your answer to Question C, determine the half-life of radium-226. E.Based on your answers to Questions C & D, determine the rate constant of the beta decay of radium-226
- A radioactive sample with a half-life of 5.3 weeks has 1.04e+15 nuclides present in the initial sample. a) What is the initial activity of this sample? Bq b) How many days does it take for this sample to decay to 3.09e+14 nuclides? daysAfter 1.86 days, the activity of a sample of an unknown type of radioactive material has decreased to 88.2% of the initial activity. What is the half-life of this material?The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 1.0*10^ 3Bq. The activity in a similar-sized sample of fresh wood is measured to be 6.9*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.