Conceptual Physical Science (6th Edition)
6th Edition
ISBN: 9780134060491
Author: Paul G. Hewitt, John A. Suchocki, Leslie A. Hewitt
Publisher: PEARSON
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Chapter 13, Problem 50E
If you make an account of 1000 people born in the year 2000 and find that half of them are still living in 2060, does this mean that one-quarter of them will be alive in 2120 and that one-eighth of them will be alive in 2180? How do the death rates of people and the “death rates” of radioactive atoms differ?
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Chapter 13 Solutions
Conceptual Physical Science (6th Edition)
Ch. 13 - Prob. 1RCQCh. 13 - What is the origin of most of the natural...Ch. 13 - Which produces mote radioactivity in the...Ch. 13 - Prob. 4RCQCh. 13 - Prob. 5RCQCh. 13 - Prob. 6RCQCh. 13 - What role do neutrons play in the atomic nucleus?Ch. 13 - Prob. 8RCQCh. 13 - Prob. 9RCQCh. 13 - What is the long-range fate of all the uranium...
Ch. 13 - What is meant by the half-life of a radioactive...Ch. 13 - What is the half-life of uranium-238?Ch. 13 - What happens to a nitrogen atom in the atmosphere...Ch. 13 - Prob. 14RCQCh. 13 - Prob. 15RCQCh. 13 - Prob. 16RCQCh. 13 - Prob. 17RCQCh. 13 - Prob. 18RCQCh. 13 - Prob. 19RCQCh. 13 - Prob. 20RCQCh. 13 - Prob. 21RCQCh. 13 - How does the mass per nucleon in uranium compare...Ch. 13 - How does the mass of a pair of atoms that have...Ch. 13 - Prob. 24RCQCh. 13 - What kind of nuclear power is responsible for...Ch. 13 - Throw ten coins onto a flat surface. Move aside...Ch. 13 - Repeat the above, but use 10 dimes and 25 pennies....Ch. 13 - Consider a radioactive sample with a half-life of...Ch. 13 - Uranium-238 absorbs a neutron and then emits a...Ch. 13 - Rank the following three types of radiation by...Ch. 13 - Prob. 35TARCh. 13 - Rank the following isotopes from the most...Ch. 13 - Rank the following in order from the most energy...Ch. 13 - Prob. 44ECh. 13 - Which should be more stable: the lithium-5 or the...Ch. 13 - Which should be more stable: the lithium-7 or the...Ch. 13 - Why is lead found in all deposits of uranium ores?Ch. 13 - Prob. 48ECh. 13 - Elements heavier than uranium in the periodic...Ch. 13 - If you make an account of 1000 people born in the...Ch. 13 - What do the proportions of lead and uranium in...Ch. 13 - Radium-226 is a common isotope on Earth, but it...Ch. 13 - Prob. 53ECh. 13 - Prob. 54ECh. 13 - Prob. 55ECh. 13 - Prob. 56ECh. 13 - Prob. 57ECh. 13 - Why is carbon better than lead as a moderator in...Ch. 13 - Prob. 59ECh. 13 - Prob. 60ECh. 13 - Prob. 61ECh. 13 - How does the mass per nucleon in uranium compare...Ch. 13 - Prob. 63ECh. 13 - Prob. 64ECh. 13 - Prob. 65ECh. 13 - Prob. 66ECh. 13 - Prob. 67ECh. 13 - Prob. 68ECh. 13 - Prob. 69ECh. 13 - Prob. 70ECh. 13 - Prob. 71ECh. 13 - Prob. 72ECh. 13 - Prob. 73ECh. 13 - Prob. 74ECh. 13 - Prob. 75ECh. 13 - Prob. 1RATCh. 13 - Prob. 2RATCh. 13 - A sample of radioactive material is usually a...Ch. 13 - What evidence supports the contention that the...Ch. 13 - When the isotope bismuth-213 emits an alpha...Ch. 13 - If uranium were to split into 90 pieces of equal...Ch. 13 - Prob. 9RATCh. 13 - If an iron nucleus split in two, its fission...
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- What fraction of a radioactive sample has decayed after two half-lives have elapsed?arrow_forwardIf a 1.50-cm-thick piece of lead can absorb 90.0% of the rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the rays?arrow_forwardA sample from human remains found near Stonehenge in England shows that 71.2% of the carbon-14 still remains. Use the model Q(1) = Qe-0.000121 to determine the age of the sample. In this model, Q(t) represents the amount of carbon-14 remaining t years after death, and Qo represents the initial amount of carbon-14 at the time of death. Round to the nearest 100 yr.arrow_forward
- 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 65. Bq. The activity in a similar-sized sample of fresh wood is measured to be 69. Bq. Calculate the age of the artifact. Round your answer to 2 significant digitsarrow_forwardThe Dead Sea scrolls, a collection of written texts mostly on dries animal skins, were found in caves along the northwest shore of the Dead Sea in the late 1940s and 1950s. Carbon-14 dating indicates that the scrolls were written about 2100 years ago. What is the rate of the radioactive decay of carbon-14 in the scrolls?arrow_forwardSuppose that instead of using half-life to characterize the radioactivity of elements, we used the idea of third-life (that is, the time it takes for one-third of a sample to decay). If the half-life of Uranium 235 is 700 million years, what would its third-life be?arrow_forward
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- The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 200 grams of a radioactive isotope, how much will be left after 4 half-lives? Use the calculator provided and round your answer to the nearest gram.arrow_forwardEach time you dumped the pennies, one half-life passed; it has been shown that thehalf-life for this radioactive isotope is 20 years. In the year 2000, an archaeology teamunearths pottery and is using this isotope for radiometric dating to place the age of thepottery. It is shown that 95% of the nuclei have decayed. Using your graph,approximately how long ago was the pottery made?arrow_forwardConsider an initial amount of 708g of radioactive material with half-life h=3.2hdays. Use a spreadsheet to record the initial amount (at day 0) and to calculate the amounts left at 1day intervals, up to day 10 included. What is the average amount of material over the time interval from day 0 to day 10? Round your answer to the nearest integer:arrow_forward
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