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Chapter 42: Q 22 Exercise (page 1236)
What is the half-life in days of a radioactive sample with 5.0 x 1015
atoms and an activity of 5.0 x 108 Bq?
Therefore the half life in days is
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The half-life of the uranium isotope is million years. The earth is approximately localid="1650486537957" billion years old. How much more was there when the earth formed than there is today? Give your answer as the then-to-now ratio.
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鈥檚 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
Identify the unknown isotope X in the following decays.
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.
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?
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