An 80 milligram sample of a radioactive isotope decays to 5 milligrams in 32 days. What is the half-life of this element?
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1 An 80 milligram sample of a radioactive isotope decays to 5 milligrams in 32 days. What is the half-life of this element? A. 8 days B. 2 days C. 6 days D. 4 days
2 An original sample of a radioisotope had a mass of 0 grams. After 2 days, 5 grams of the radioisotope remains unchanged. What is the half-life of this radioisotope? A. day B. 2 days C. 5 days D. 4 days
3 The ratio of uranium-238 to lead-206 in a mineral is used to determine A. age B. density C. solubility D. composition
4 A radioactive isotope has a half-life of 0 years. What fraction of the original mass will remain unchanged after 50 years? A. 2 B. 8 C. 6 D. 32
5 The radioactive isotope carbon-4 can be used for A. determining the age of a sample B. determining medical disorders C. controlling fission reaction D. controlling speeds of neutrons
6 As a sample of a radioactive element decays, its half-life A. decreases B. increases C. remains the same
7 The graph represents the decay curve of a radioactive isotope. The half-life of this isotope is A. 8 years B. 30 years C. 45 years D. 60 years
8 A radioactive element has a half-life of 2 days. Which fraction represents the amount of an original sample of this element remaining after 6 days? A. 8 B. 2 C. 3 D. 4
9 As the temperature of a sample of a radioactive element decreases, the half-life of the element will A. decrease B. increase C. remain the same
10 The half-life of 3 I is 8.07 days. What fraction of a sample of 3 I remains after 24.2 days? A. 2 B. 4 C. 8 D. 6
11 The half-life of a radioactive substance is 2.5 minutes. What fraction of the original radioactive substance remains after 0 minutes? A. 2 B. 4 C. 8 D. 6
12 A graph of the radioactive decay of carbon-4 is shown. Which graph correctly shows the accumulation of nitrogen-4, the decay product of carbon-4, over the same period? A. B. C. D.
13 Base your answer(s) to the following question(s) on the Earth Science Reference Tables, the graph below, and your knowledge of Earth science. The graph represents the decay of radioactive material X into a stable decay product. What is the approximate half-life of radioactive material X? A. 5,000 yr B. 0,000 yr C. 50,000 yr D. 00,000 yr
14 Base your answer(s) to the following question(s) on the Earth Science Reference Tables, the graph below, and your knowledge of Earth science. The graph represents the decay of radioactive material X into a stable decay product. Which graph best represents the relative percentages of radioactive material X and its stable decay product after 5,000 years? A. B. C. D.
15 Base your answer(s) to the following question(s) on the Earth Science Reference Tables, the graph below, and your knowledge of Earth science. The graph represents the decay of radioactive material X into a stable decay product. Each of the objects below has different amounts remaining of the original radioactive material X. Which object is most likely the oldest? A. B. C. D.
16 A bone sample contains only 4 of its original radioactive C4 content. How old is the bone sample? A. C 4 half-life B. 2 C 4 half-lives C. 9 C 4 half-lives D. 4 C 4 half-lives
17 The accompanying diagram represents the present number of decayed and undecayed atoms in a sample that was originally 00% radioactive material. If the half-life of the radioactive material is,000 years, what is the age of the sample represented by the diagram? A.,000 yr B. 2,000 yr C. 3,000 yr D. 4,000 yr
18 The table below gives information about the radioactive decay of carbon-4. Part of the table has been deliberately left blank for student use. Half-life Mass of Original Carbon-4 Remaining (grams) Number of Years , , , After how many years will 28 gram of the original carbon-4 remain? A. 22,800 yr B. 28,500 yr C. 34,200 yr D. 39,900 yr
19 Which graph best shows the radioactive decay of carbon-4? A. B. C. D.
20 The graph below shows the rate of decay of the radioactive isotope K-40 into the decay products Ar-40 and Ca-40. Analysis of a basalt rock sample shows that 25% of its radioactive K-40 remained undecayed. How old is the basalt? A..3 billion years B. 2.6 billion years C. 3.9 billion years D. 4.6 billion years
21 The diagram below represents a sample of rubidium-87 ( 87 Rb). Which diagram represents the correct proportion of 87 Rb to its decay product, 87 Sr, after two half-lives? A. B. C. D.
22 Problem-Attic format version c EducAide Software Licensed for use by jim benedict Terms of Use at half-life practice questions 03/24/ A B A D A C B A C C D C A D A B B D D B B
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