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Chapter 42: Q 34 Exercise (page 1237)
1.5 Gy of gamma radiation are directed into a 150 g tumour
during radiation therapy. How much energy does the tumour
absorb?
Hence, tumour absorbs the energy of
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What is the total energy (in MeV) released in the beta decay
of a neutron?
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?
Apple A in FIGURE Q42.8 is strongly irradiated by nuclear radiation for 1 hour. Apple B is not irradiated. Afterward, in what ways
are apples A and B different?
How many grays of gamma-ray photons cause the same bio-
logical damage as 30 Gy of alpha radiation?
A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is . What is the half-life of B?
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