CHEM 104 F inal Exam; Questions and Answers 100% Solved what is the charge of a beta particle? Correct answer --1 what is the name given to the energy that is responsible for holding the protons and neutrons together in the nucleus? Correct answer -binding energy why do radiation workers wear a film badge? Correct answer -to measure their cumulative level of exposure to radiation true or false: gamma rays move at the speed of light. Correct answer -true a 50 -mg sample of iodine -131 was placed in a container 32.4 days ago. its half -life is 8.1 days. how many milligrams of iodine -131 are present now? Correct answer -3.1 mg which radioactive element is sometimes found in indoor air in such places as basements? Correct answer -radon what particle or nucleus X is needed to complete the following equation? 40/19K --> 0/-1e + X Correct answer -calcium -40 when a molecule is hit by gamma radiation, which of the following is likely to occur? Correct answer -ionization what is the nuclear symbol for the isotope when 16/7N undergoes beta decay? Correct answer -16/8O what term is used to describe radioactive substances that are used as probes to study internal organs? Correct answer -tracers CHEM 104 F inal Exam; Questions and Answers 100% Solved the isotope 226/88Ra decays to 222/86Rn by emitting radiation. What type of radiation is emitted? Correct answer -alpha what type of radioactive decay is illustrated by the following nuclear equation? 16/7N --> 16/8O + 0/-1e Correct answer -beta decay true or false: commercial nuclear power plants use the fusion process to generate electrical energy Correct answer -false which of the following particles or rays requires barriers of lead and/or concrete for adequate protection? Correct answer -gamma give the missing symbol to the following nuclear reaction. 11/6C --> 11/5B + ____ Correct answer -o/+1e which radioactive emission can be stopped by a few sheets of paper? Correct answer -
alpha in the general symbol (A/Z)X for a nucleus, how is the number of neutrons calculated? Correct answer -A-Z true or false: the mass number of an alpha particle is 4. Correct answer -true the half -life of cobalt -60 is 5.3 years. What percent of a sample of cobalt -60 will remain after 21.2 years? Correct answer -6.25% true or false: compared to the energy of chemical bonds, nuclear binding energy is very weak Correct answer -false
alpha in the general symbol (A/Z)X for a nucleus, how is the number of neutrons calculated? Correct answer -A-Z true or false: the mass number of an alpha particle is 4. Correct answer -true the half -life of cobalt -60 is 5.3 years. What percent of a sample of cobalt -60 will remain after 21.2 years? Correct answer -6.25% true or false: compared to the energy of chemical bonds, nuclear binding energy is very weak Correct answer -false
