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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Textbook Question
Chapter 13, Problem 11RCQ
What is meant by the half-life of a radioactive sample?
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If a sample of radioactive isotopes takes 60 minutes to decay from 200 grams to 50 grams, what is the half-life of the isotope? Hint: First, determine how many times the sample has lost half of its mass, which tells you how many half-life cycles have occurred.
What fraction of a radioactive sample is left after exactly 6 half lives? Give your
answer to 3 decimals.
Your Answer:
Answer
The graph below shows how the
radioactivity of a particular
isotope varies with time. What is
the half-life of this isotope?
10
15
20
Time (days)
Activity (counts/minute)
O 12.5 days
5 days
10 days
O 2.5 days
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 1.50cmthick 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 radioactive sample initially contains 2.40102 mol of a radioactive material whose half-life is 6.00 h. How many moles of the radioactive material remain after 6.00 h? After 12.0 h? After 36.0 h?arrow_forward
- If 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_forwardNatural uranium consists of 235U(percent abundance = 0.7200%, =3.121017/s ) and 238U (percent abundance = 99.27% , =4.921018/s ). What were the values for percent abundance of 235Uand 238Uwhen Earth formed 4.5109years ago?arrow_forwardA radioactive sample has an activity R. For each of the following changes, indicate whether the activity would increase, decrease. or remain unchanged. Indicate your answers with I, D, or U. (a) The number of radioactive nuclei in the sample is doubled. (b) The half-life of the radioactive nuclei is doubled. (c) The decay constant is doubled. (d) A time period equal to two half-lives is allowed to elapse.arrow_forward
- Suppose you have a pure radioactive material with a half-life of T1/2. You begin with N0 undecayed nuclei of the material at t = 0. At t=12T1/2, how many of the nuclei have decayed? (a) 14N0 (b) 12N0(C) 34N0 (d) 0.707N0 (e) 0.293N0arrow_forwardActinium-225 (89225Ac) undergoes alpha decay. (a) Write the equation. (b) The daughter formed in part (a) undergoes beta decay. Write the equation.arrow_forwardWhat characteristics of radioactivity show it to be nuclear in origin and not atomic?arrow_forward
- In discussions of nuclear fusion reactions, the letter D stands for ___. (10.6)arrow_forwardSuppose a person swallows some radioactive material by accident. What information is needed to be able to assess possible damage?arrow_forwardIf two grams of a radioactive isotope has a half - life of twenty hours, the half life of one gram of the same substance is a) 40 hr b) 1 day c) 20hr d) 80hrarrow_forward
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Half life | Radioactivity | Physics | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=IDkNlU7zKYU;License: Standard YouTube License, CC-BY