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Chapter 42: Q 4 Exercise (page 1236)
Calculate the mass, radius, and density of the nucleus of .
Give all answers in SI units.
Hence, the mass, radius and density is:
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Use the graph of binding energy to estimate the total energy released if a nucleus with mass number 240 fissions into two nuclei with mass number 120.
Use the potential-energy diagram in Figure to estimate the strength of the strong force between two nucleons separated by fm.
Beta-plus decay is
a. Determine the mass threshold for beta-plus decay. That is, what is the minimum atomic mass mX for which this decay is energetically possible? Your answer will be in terms of the atomic mass mY and the electron mass me.
b. Can 13 N undergo beta-plus decay into 13 C? If so, how much energy is released in the decay?
The activity of a sample of the cesium isotope , with a half-life of 30 years, is . Many years later, after the sample has fully decayed, how many beta particles will have been emitted?
All the very heavy atoms found in the earth were created long ago by nuclear fusion reactions in a supernova, an exploding star. The debris spewed out by the supernova later coalesced into the gases from which the sun and the planets of our solar system were formed. Nuclear physics suggests that the uranium isotopes 235 U and 238 U should have been created in roughly equal numbers. Today, 99.28% of uranium is 238 U and only 0.72% is 235 U. How long ago did the supernova occur?
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