Question

19. An isotope with a high value of N/Z will end to decay through: a. alpha decay b. beta decay C. positron decay d. electron capture e. gamma decay 20.Identify the missing species in the following nuclear transmutation: 246Cm +12C 41n+? a. 254No b. 258No c. 238Cf d. 238Th e. none of the above 21. The isotope 42Sc is unstable because: a. the number of neutrons is too large in relation to the number of protons b. the number of neutrons is too small in relation to the number of protons c. the atomic number is too large d. the mass number is too large e. Sc isotopes are all unstable 22.The least penetrating form of radiation is a. alpha b. beta c. gamma d. positrons 23.PET scans which map blood flow and sugar uptake in the brains of human patients use: a. alpha particles b. beta particles c. gamma particles d. positrons

Answer 1

9) b) Beta dacay 2S4 20 246 12- too laxge 21) c) atomic numbeu iooo 23) c) jammo