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Chapter 42: Q 32 Exercise (page 1237)
What is the total energy (in MeV) released in the beta decay
of a neutron?
Therefore, the total energy released is
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The uranium isotope is naturally present at low levels in many soils. One of the nuclei in the decay series of is the radon isotope , which decays by emitting a localid="1650487447445" alpha particle with localid="1650487458663" days. Radon is a gas, and it tends to seep from soil into basements. The Environmental Protection Agency recommends that homeowners take steps to remove radon, by pumping in fresh air, if the radon activity exceeds of air.
a. How many atoms are there in of air if the activity is ?
b. The range of alpha particles in air is . Suppose we model a person as a -tall, -diameter cylinder with a mass of . Only decays within of the cylinder can cause exposure, and only , of the decays direct the alpha particle toward the person. Determine the dose in for a person who spends the entire year in a room where the activity is .
c. Does the EPA recommendation seem appropriate? Why?
Nucleus A decays into nucleus B with a half-life of 10 s. At
t = 0 s, there are 1000 A nuclei and no B nuclei. At what time
will there be 750 B nuclei?
A 1 Ci source of radiation is a significant source. 238 U is an alpha emitter. What mass of 238 U has an activity of 1 Ci?
What energy (in MeV) alpha particle has a de Broglie wavelength equal to the diameter of nucleus?
Use the potential-energy diagram in Figure to estimate the strength of the strong force between two nucleons separated by fm.
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