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Chapter 42: Q 31 Exercise (page 1236)
What is the total energy (in MeV) released in the beta-minus
decay of 3H?
Hence, the energy released is
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Use the potential-energy diagram in Figure to sketch an approximate graph of the strong force between two nucleons versus the distance between their centers.
A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is . What is the half-life of B?
a. Is the binding energy of a nucleus with more than, less than, or equal to the binding energy of a nucleus with ? Explain.
b. Is a nucleus with more tightly bound, less tightly bound, or bound equally tightly as a nucleus with ? Explain.
The fact that A cancels means that all nuclei have this density. It is a staggeringly large density, roughly 1014 times larger than the density of familiar liquids and solids. One early objection to Rutherford’s model of a nuclear atom was that matter simply couldn’t have a density this high. Although we have no direct experience with such matter, nuclear matter really is this dense .
A sample of 1.0x1010atoms that decay by alpha emission
has a half-life of 100 min. How many alpha particles are emitted
between t = 50 min and t = 200 min?
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