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Chapter 42: Q 18 Exercise (page 1236)
The barium isotope 131Ba has a half-life of 12 days. A 250 mg
sample of 131Ba is prepared. What is the mass of 131Ba after
(a) 1 day, (b) 10 days, and (c) 100 days?
Therefore, the mass is
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Could a nucleus fission into two nuclei? Your answer, which should include some calculations, should be based on the curve of binding energy.
a. What is the smallest value of for which there are two stable nuclei? What are they?
b. For which values ofless than this are there no stable nuclei?
Calculate (in ) the total binding energy and the binding energy per nucleon for and for .
| The element gallium has two stable isotopes: 69 Ga with an atomic mass of 68.92 u and 71 Ga with an atomic mass of 70.92 u. A periodic table shows that the chemical atomic mass of gallium is 69.72 u. What is the percent abundance of 69 Ga?
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 . 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 .
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.
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