>C< WLU PHYSICAL SCIENCE
16th Edition
ISBN: 9781308807508
Author: Tillery
Publisher: MCG/CREATE
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Chapter 13, Problem 40AC
To determine
From the following options, the energy source from the sun is:
a. chemical (burning).
b. fission.
c. fusion.
d. radioactive decay
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5.Atree falls in a forest. How many years must pass before the carbon-14 mass in the tree’s carbon drops to 3.125% of its value in living tree? The half-life of carbon-14 is T= 5570 years.
1. Calculate the age of the fossil given that the amount of 14C found in it is 92 percent of that in living tissue. Carbon-14 has a half life of 5730 years ?
Choose the BEST answer to the following.
Most of the radiation in Earth’s biosphere is
(a) natural background radiation.
(b) the result of military activities.
(c) from nuclear power plants.
(d) in the form of cosmic rays.
Chapter 13 Solutions
>C< WLU PHYSICAL SCIENCE
Ch. 13 - Prob. 1ACCh. 13 - Prob. 2ACCh. 13 - Prob. 3ACCh. 13 - Prob. 4ACCh. 13 - Prob. 5ACCh. 13 - Prob. 6ACCh. 13 - Prob. 7ACCh. 13 - Prob. 8ACCh. 13 - Prob. 9ACCh. 13 - Prob. 10AC
Ch. 13 - Prob. 11ACCh. 13 - Prob. 12ACCh. 13 - Prob. 13ACCh. 13 - Prob. 14ACCh. 13 - Prob. 15ACCh. 13 - Prob. 16ACCh. 13 - Prob. 17ACCh. 13 - Prob. 18ACCh. 13 - Prob. 19ACCh. 13 - Prob. 20ACCh. 13 - Prob. 21ACCh. 13 - Prob. 22ACCh. 13 - Prob. 23ACCh. 13 - Prob. 24ACCh. 13 - Prob. 25ACCh. 13 - Prob. 26ACCh. 13 - Prob. 27ACCh. 13 - Prob. 28ACCh. 13 - Prob. 29ACCh. 13 - Prob. 30ACCh. 13 - Prob. 31ACCh. 13 - Prob. 32ACCh. 13 - Prob. 33ACCh. 13 - Prob. 34ACCh. 13 - Prob. 35ACCh. 13 - Prob. 36ACCh. 13 - Prob. 37ACCh. 13 - Prob. 38ACCh. 13 - Prob. 39ACCh. 13 - Prob. 40ACCh. 13 - Prob. 41ACCh. 13 - Prob. 42ACCh. 13 - Prob. 43ACCh. 13 - Prob. 44ACCh. 13 - Prob. 45ACCh. 13 - Prob. 46ACCh. 13 - Prob. 1QFTCh. 13 - Prob. 2QFTCh. 13 - Prob. 3QFTCh. 13 - Prob. 4QFTCh. 13 -
5. What is a half-life? Give an example of the...Ch. 13 - Prob. 6QFTCh. 13 - Prob. 7QFTCh. 13 -
8. What is meant by background radiation? What is...Ch. 13 - Prob. 9QFTCh. 13 - What is a mass defect? How is it related to the...Ch. 13 - Prob. 11QFTCh. 13 - Prob. 1FFACh. 13 - Prob. 2FFACh. 13 -
3. Make up a feasible explanation for why some...Ch. 13 - Prob. 5FFACh. 13 - Prob. 7FFACh. 13 - Prob. 1PEBCh. 13 - Prob. 2PEBCh. 13 -
3. Predict if the nuclei in exercise 1 are...Ch. 13 - Prob. 4PEBCh. 13 - Prob. 5PEBCh. 13 -
6. If the half-life of cesium–137 is 30 years,...
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- A group of scientists use carbon dating to date a piece of wood to be 3 billion years old. Why doesn’t this make sense?arrow_forward5. If a 10-gram sample of a radioactive substance has a half-life of 6000 years, how much would be present after 8000 years? 6. If Nitrogen-14 absorbs an alpha particle and then emits a Hydrogen-1, what is the resulting nucleus?arrow_forwardThe radioactive gas krypton-85, produced by nuclear power plants as well as volcanoes, is present in trace amounts in earth’s atmosphere. Its half-life is 10.8 years. Suppose a volcano released 250 g of krypton-85 in an eruption. How much would remain after (a) 10.8 years, (b) 15 years, and (c) 50 years? Round to the nearest tenth of a gram.arrow_forward
- 4.What are beneficial applications of radiation? Select two that apply. 1.Radioactive nuclides are used to power objects such as rocket engines. 2.Radiation treatments are used to kill cancer cells. 3.Radiation treatments are used to examine tissue under microscopes and make diagnoses. 4.Radioactive nuclides are used to date rocks and artifacts.arrow_forwardReview. The North American and European plates of the Earths crust are drifting apart with a relative speed of about 25 mm/yr. Take the speed as constant and find when the rift between them started to open, to reach a current width of 2.9 103 mi.arrow_forwardWhat energy sources on Earth cannot be thought of as stored sunlight?arrow_forward
- Construct Your Own Problem Consider the decay of radioactive substances in the Earth's interior. The energy emitted is converted to thermal energy that reaches the earth's surface and is radiated away into cold dark space. Construct a problem in which you estimate the activity in a cubic meter of earth rock? And then calculate the power generated. Calculate how much power must cross each square meter of the Earth’s surface if the power is dissipated at the same rate as it is generated. Among the things to consider are the activity per cubic meter, the energy per decay, and the size of the Earth.arrow_forwardExplain the difference between nuclear fission and nuclear fusion.arrow_forward(20)The half-life of Carbon-14 is 5700 years. If a 16 gram sample is found in a rock layer known to be 42,000 years old, how much Carbon-14 did it start with? Group of answer choices 1400 g 3700 g 3100 g 5300 g 2600 garrow_forward
- 2) Uranium-238 undergoes alpha decay. Into what element does Uranium 238 transmute? What is the atomic number of the new element? 4) Technetium-99 m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally 100mg , how much would remain after 24 hours? 5) How long would it take a 1-kg radioactive substance with a half-life of 100 years to decay into1 2.5 g?arrow_forwardWhat are radioactive substances? Give some examples.arrow_forwardThe carbon content of living trees includes a small proportion of C-14, which is a radioactive isotope. After a tree dies, the proportion of C-14 in it decreases due to radioactive decay.Suggest why the method of carbon dating is likely to be unreliable if a sample is:a) < 200 years oldb) > 60,000 years oldarrow_forward
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