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SPH 3U1 Nuclear Physics Review Questions 1. Define each of the following terms: a) isotope b) nucleon c) alpha particle d) beta particle e) radioactive decay 2. What do the quantities A, Z and N represent? 3. Why does the atomic number increase by one in beta decay? 4. What does it mean for two atoms to be different isotopes of the same element? 5. What is a half-life? 6. What is the mass defect? 7. Explain the difference between fission and fusion. 8. State A, Z and N for: 56 39 Fe Ar a) 26 b) 19 c) 199 84 Po 60 40 Ni K d) 28 e) 19 f) 208 82 Pb 9. Write the names for the following atoms in nuclear notation: a) carbon-13 b) Z=74, N=110 c) N=66, A=155 d) carbon-14 e) iron-56 f) uranium-238 g) Z=80, N=121 h) Z=14, N=16 i) Z=2, N=3 10. Write the alpha decay reaction for: a) 150 b) 203 c) 147 86 Rn 63 Eu 64 Gd 64 Cu d) 29 e) 239 94 Pu 11. Write the beta decay reaction for: a) 01 n b) 141 53 I f) 48 Be c) 102 41 Nb 35 S d) 198 O e) 16 f) 131 53 I 12. Uranium-237 has a half-life of 6.75 days. What percentage of an initial sample of uranium-237 decays a) over 13.5 days? b) remains after 27 days? 13. A radioactive isotope has a half-life of 2.5 d. You start with 100.0 g of the material. How much will be left after: a) 2.5 d b) 5.0 d c) 10.0 d 14. A radioactive tracer used in a medical test has a half-life of 2.4 h. What fraction of this tracer will remain in 12 h?