Nuclear 1 105 45 Rh has a neutron to proton ratio slightly higher than needed to place it on the belt of stability The type of radioactive decay it is likely to undergo is A B C D E 2 In the following nuclear reaction what are the values of x and y A B C D E 3 x 226 y 90 x 230 y 88 x 226 y 88 x 228 y 86 x 234 y 92 Which of the following isotopes is most likely to be a positron emitter A B C D E 4 emission emission electron capture positron emission none of the above 25 Si Mg 32 Si 25 Mg 28 Si 27 Which of the following types of nuclear decay results in an increase in the nuclear charge A B C D E alpha emission positron emission beta emission electron capture gamma emission 5 When 235 92 U is bombarded with one neutron fission occurs and the products are three neutrons 6 7 94 36 A 139 56 Ba B 141 56 Ba C 139 58 D 139 54 Xe E 142 53 I 55 25 K and Ce Mn can be prepared by electron capture from A 55 24 B 55 26 Fe C 56 25 Mn D 56 23 E 56 26 Cr V Fe The half life of 239Pu is 24 000 years What fraction of the 239Pu present in nuclear wastes generated today year 2000 will be present in the year 3000 A B C D E 0 95 0 92 1 03 0 97 0 90 8 The 14C 12C ratio in a wooden artifact is 1 8 the 14C 12C ratio in today s atmosphere How old is the artifact t1 2 for 14C 5 700 years A B C D E 9 45 600 years 17 100 years 700 years 1 900 years 11 400 years A wooden artifact from China has a 14C activity of 24 counts min as compared to an activity of 31 7 count min for modern contemporary wood What is the age of the artifact Half life for 14C is 5700 years A B C D B 10 11 1700 years 2300 years 4600 years 3750 years 4340 years A rock contains 0 313mg of 206Pb for each milligram of 238U The half life for the decay of 238U to 206Pb is 4 5 109 yr How long ago was the rock formed A 1 08 109 years B 1 39 109 years C 1 41 109 years D 1 56 109 years E 2 00 109 years 36 Cl is a emitter with a half life of 3 00 105 yr The activity of a sample of NaCl is 1 20 disintegrations per second How many atoms of 36Cl are in the sample assuming that 36Cl is the only source of decay A B C D E 3 25 1021 9 81 1017 6 02 1023 1 64 1013 Insufficient information to answer question 12 How much energy must he supplied to break a single 6Li nucleus into separated protons and neutrons Masses 6Li 6 01347amu 1H 1 00728amu 1n 1 00867 amu A B C D E 13 3 09 x 1012 J 1 54 x 10 3 J 5 14 x 10 9 J 5 14 x 10 12 J 3 09 x 1015 J What is the binding energy of Which one of the following statements concerning the nuclear reactor is correct A B C D E 15 Co The mass of 60Co nucleus is 59 9338amu 9 117x10 28 J 8 206x10 11 J 4 940x10 13 J 2 735x10 19 J 2 735x10 16 J A B C D E 14 60 27 235 Pure 92 U is used as the fuel in the reactor If allowed to overheat the reactor can explode like a nuclear bomb Water is never used as a coolant for the reactor core Heat is initially supplied to the reactor core to start the chain reaction The control rods present in the reactor absorb excess neutrons Carbon 11 is used in medical imaging The half life of this radioisotope is 20 4 min What percentage of a sample remains after 60 0 min A 71 2 B 5 28 C 13 0 D 34 0 E 2 94 16 Nuclear Magnetic Resonance NMR is best described by which of the following A the process by which a substance becomes ferromagnetic or a permanent magnet B the nuclear reaction between two small unstable nuclei to form a larger more stable nucleus C a diagnostic tool to determine the number of chemical environments of a certain element in a sample D the decay process of a large unstable nucleus to form smaller more stable nuclei E the treatment of diseases such as cancer by high energy radiation 17 The nuclear spin quantum number I for a proton 1H is How many possible nuclear spin states does a proton have A B C D E 0 1 1 2 18 In MRI the resonant frequency absorbed by protons is on order of 200MHz What is the energy of a photon that can be absorbed by H under these conditions A B C D E 1 32 10 25 J 3 31 10 42 J 1 50 10 14 J 3 31 10 30 J 1 32 10 31 J