Chapter 21: Problem 10
Give the symbol for (a) a proton, (b) a beta particle, (c) a positron.
Chapter 21: Problem 10
Give the symbol for (a) a proton, (b) a beta particle, (c) a positron.
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Get started for freeCharcoal samples from Stonehenge in England were burned in \(\mathrm{O}_{2}\), and the resultant \(\mathrm{CO}_{2}\) gas bubbled into a solution of \(\mathrm{Ca}(\mathrm{OH})_{2}\) (limewater), resulting in the precipitation of \(\mathrm{CaCO}_{3}\). The \(\mathrm{CaCO}_{3}\) was removed by filtration and dried. A \(788-\mathrm{mg}\) sample of the \(\mathrm{CaCO}_{3}\) had a radioactivity of \(1.5 \times 10^{-2}\) Bq due to carbon-14. By comparison, living organisms undergo \(15.3\) disintegrations per minute per gram of carbon. Using the half-life of carbon- 14,5715 yr, calculate the age of the charcoal sample.
It has been suggested that strontium-90 (generated by nuclear testing) deposited in the hot desert will undergo radioactive decay more rapidly because it will be exposed to much higher average temperatures. (a) Is this a reasonable suggestion? (b) Does the process of radioactive decay have an activation energy, like the Arrhenius behavior of many chemical reactions \({ }^{\infty} 0\) (Section \(\left.14.5\right) ?\) Discuss.
A 26.00-g sample of water containing tritium, \({ }_{1}^{3} \mathrm{H}\), emits \(1.50 \times 10^{3}\) beta particles per second. Tritium is a weak beta emitter, with a half-life of \(12.3\) yr. What fraction of all the hydrogen in the water sample is tritium?
What particle is produced during the following decay processes: (a) sodium-24 decays to magnesium-24; (b) mercury-188 decays to gold-188; (c) iodine-122 decays to xenon-122; (d) plutonium-242 decays to uranium-238?
It takes \(5.2\) minutesfor a \(1.000-g\) sample of \({ }^{210} \mathrm{Fr}\) to decay to \(0.250 \mathrm{~g}\). What is the half-life of \({ }^{210} \mathrm{Fr}\) ?
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