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Chapter 42: Q. 12 (page 1236)
Calculate the chemical atomic mass of silicon.
The chemical atomic mass of silicon is.
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Which stable nuclei have a diameter of 7.46 fm?
What is the total energy (in MeV) released in the beta-minus
decay of 24Na?
The technique known as potassium-argon dating is used to date old lava flows. The potassium isotope 40 K has a 1.28-billionyear half-life and is naturally present at very low levels. 40 K decays by two routes: 89% undergo beta-minus decay into 40 Ca while 11% undergo electron capture to become 40 Ar. Argon is a gas, and there is no argon in flowing lava because the gas escapes. Once the lava solidifies, any argon produced in the decay of 40 K is trapped inside and cannot escape. A geologist brings you a piece of solidified lava in which you find the 40 Ar/ 40 K ratio to be 0.013. What is the age of the rock?
What energy (in MeV) alpha particle has a de Broglie wavelength equal to the diameter of nucleus?
a. What are the isotopic symbols of all A = 19 isobars?
b. Which of these are stable nuclei?
c. For those that are not stable, identify both the decay mode and the daughter nucleus.
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