4. What particle (a particle, electron, or positron) is emitted in the following radioactive decays? (a) Si — 13A1, (b)

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4 What Particle A Particle Electron Or Positron Is Emitted In The Following Radioactive Decays A Si 13a1 B 1 (32.98 KiB) Viewed 73 times

4. What particle (a particle, electron, or positron) is emitted in the following radioactive decays? (a) Si — 13A1, (b) 233 234Th, (c) 33AS - Se. 5. Tritium His an unstable isotope of hydrogen; its mass, including one electron, is 3.016049 u. (a) Show that tritium must be unstable with respect to beta decay because the decay products (He plus an emitted electron) have less total mass than the tritium. (b) Determine the total kinetic energy (in MeV) of the decay products, taking care to account for the electron masses correctly. 6. If a 6.13-g sample of an isotope having a mass number of 124 decays at a rate of 0.350 Ci, what is its half- life. 7. A 12.0-g sample of carbon from living matter decays at the rate of 184 decays>minute due to the radioactive C in it. What will be the decay rate of this sample in (a) 1000 years and (b) 50,000 years?