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Chapter 42: Q.52 (page 1237)
How many half-lives must elapse until (a) 90% and (b) 99% of a radioactive sample of atoms has decayed?
Use the expression for the activity of the sample present after time t to calculate the age of the sample.
The activity of the sample present after time t is,
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The half-life of the uranium isotope 235 U is 700 million years. The earth is approximately 4.5 billion years old. How much more 235 U was there when the earth formed than there is today? Give your answer as the then-to-now ratio
Does each nuclear energy-level diagram in FIGURE Q42.4 represent a nuclear ground state, an excited nuclear state, or an impossible nucleus? Explain.
What is the total energy (in MeV) released in the beta decay
of a neutron?
The activity of a sample of the cesium isotope 137 Cs, with a half-life of 30 years, is 2.0 * 108 Bq. Many years later, after the sample has fully decayed, how many beta particles will have been emitted?
What is the total energy (in MeV) released in the beta-minus
decay of 3H?
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