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Chapter 42: Q. 13 (page 1236)
Use the potential-energy diagram in Figureto estimate the strength of the strong force between two nucleons separated by .
The strong force between the two nucleons separated by is
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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?
Stars are powered by nuclear reactions that fuse hydrogen into helium. The fate of many stars, once most of the hydrogen is used up, is to collapse, under gravitational pull, into a neutron star. The force of gravity becomes so large that protons and electrons are fused into neutrons in the reaction p+ + e- S n + n. The entire star is then a tightly packed ball of neutrons with the density of nuclear matter. a. Suppose the sun collapses into a neutron star. What will its radius be? Give your answer in km. b. The sun’s rotation period is now 27 days. What will its rotation period be after it collapses? Rapidly rotating neutron stars emit pulses of radio waves at the rotation frequency and are known as pulsars
How many half-lives must elapse until (a) 90% and (b) 99% of a radioactive sample of atoms has decayed?
How many protons and how many neutrons are in
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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