Chapter 42: Q89P (page 1307)
What is the likely mass number of a spherical nucleus with a radius of 3.6 fm as measured by electron-scattering methods?
Short Answer
The likely mass number of the nucleus is 27.
Chapter 42: Q89P (page 1307)
What is the likely mass number of a spherical nucleus with a radius of 3.6 fm as measured by electron-scattering methods?
The likely mass number of the nucleus is 27.
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Get started for freeA periodic table might list the average atomic mass of magnesium as being 24.312u, which the result of weighting the atomic masses of the magnesium isotopes is according to their natural abundances on Earth. The three isotopes and their masses are , , and. The natural abundance ofis 78.99%by mass (that is, 78.99%of the mass of a naturally occurring sample of magnesium is due to the presence of).What is the abundance of (a)and (b)?
Figure 42-16 gives the activities of three radioactive samples versus time. Rank the samples according to their (a) half-life and (b) disintegration constant, greatest first. (Hint:For (a), use a straightedge on the graph.)
What is the activity of a20ngsample, which has a half-life of 1.84s?
After a brief neutron irradiation of silver, two isotopes are present: with an initial decay rate of ,and role="math" localid="1661598035621" with an initial decay rate of. Make a semilog plot similar to Fig. 42-9 showing the total combined decay rate of the two isotopes as a function of time t = 0 from until t = 10min .We used Fig. 42-9 to illustrate the extraction of the half-life for simple (one isotope) decays. Given only your plot of total decay rate for the two-isotope system here, suggest a way to analyze it in order to find the half-lives of both isotopes.
What is the nuclear mass densityof (a) the fairly low-mass nuclide and (b) the fairly high-mass nuclide ? (c) Compare the two answers, with an explanation. What is the nuclear charge densityof (d) and (e) ? (f) Compare the two answers, with an explanation.
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