Chapter 42: Q 7 Conceptual Question (page 1235)
What kind of decay, if any, can occur for the nuclei in
FIGURE Q42.7?
Short Answer
Hence, the decays which can occur are explained.
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Chapter 42: Q 7 Conceptual Question (page 1235)
What kind of decay, if any, can occur for the nuclei in
FIGURE Q42.7?
Hence, the decays which can occur are explained.
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You learned in Chapter 41 that the binding energy of the electron in a hydrogen atom is .
a. By how much does the mass decrease when a hydrogen atom is formed from a proton and an electron? Give your answer both in atomic mass units and as a percentage of the mass of the hydrogen atom.
b. By how much does the mass decrease when a helium nucleus is formed from two protons and two neutrons? Give your answer both in atomic mass units and as a percentage of the mass of the helium nucleus.
c. Compare your answers to parts a and b. Why do you hear it said that mass is 鈥渓ost鈥 in nuclear reactions but not in chemical reactions?
a. Draw energy-level diagrams, similar to Figure , for all nuclei listed in Appendix C. Show all the occu-pied neutron and proton levels.
b. Which of these nuclei are stable? What is the decay mode of any that are radioactive?
The doctors planning a radiation therapy treatment have determined that a 100 g tumour needs to receive 0.20 J of gamma
radiation. What is the dose in grays?
The three isotopes
Which of these isotopes would be most useful as a biological tracer? Why?All the very heavy atoms found in the earth were created long ago by nuclear fusion reactions in a supernova, an exploding star. The debris spewed out by the supernova later coalesced into the gases from which the sun and the planets of our solar system were formed. Nuclear physics suggests that the uranium isotopes 235 U and 238 U should have been created in roughly equal numbers. Today, 99.28% of uranium is 238 U and only 0.72% is 235 U. How long ago did the supernova occur?
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