SOLVED

21) Which of the following types of nuclear decay result in a decrease in nuclear charge? I)alpha emission II)beta emission III)position emission IV)electron-capture A) I and II B) II and IV C) I and III D) III and IV E) IV only 22) Which of the following would have the greatest penetrating power through matter? A) gamma rays B) alpha particles C) protons D) beta particles E) positron particles 23) Most periodic tables indicate the elements for which all isotopes are radioactive. Which pair of elements with atomic number less than 83 have only radioactive isotopes? A) Pb and At B) Tc and Cd C) K and Pm D) Tc and Pm E) C and K 24) Consider the following nuclear reactions. + → 1 + 1 → + 2 What are the nuclides 1 and 2, respectively? A) and B) and C) and D) and 2 25) Choose the possible products for the nuclear reaction 40Ca + 4He(alpha). A) 43Ar + n B) 43Sc + p C) 43Ca + n D) 42Ca + 2H E) 42Ti + n 26) Transuranium elements can be produced by bombarding nuclei with: A) neutrons B) other nuclei C) alpha particles D) positrons E) neutrons and/or other nuclei 27) There have been two ways of making transuranium elements: neutron bombardment and: A) beta bombardment B) gamma bombardment C) positron bombardment D) photon bombardment E) heavy-atom bombardment 28) There have been two ways of making transuranium elements: heavy-atom bombardment and: A) beta bombardment B) gamma bombardment C) positron bombardment D) photon bombardment E) neutron bombardment 29) In the case of radioactive element X, which decays by electron emission with a half-life of 4 days to a stable nuclide of element Z: A) 2 g of element X is required to produce 1.5 g of element Z after 8 days B) element Z will weigh considerably less than element X after decay is complete because of the loss of electrons C) element Z will weigh more than element X when decay is complete since Z has the higher atomic number D) after 8 days the sample will consist of one-fourth element Z and three-fourths element X E) after 8 days element X will be all element Z 30) Choose the INCORRECT statement. A) Bi-209 has the highest mass number and atomic number of any stable isotope. B) The radioactive decay law is A = θN. C) Radioactive decay is a first-order process. D) The half-life is the length of time for all atoms of an isotope to decay. E) Wood can be dated by radiocarbon dating.