The combining of two nuclei to form a larger nucleus with the release of energy is
a. nuclear fission.
b. nuclear fusion.
c. neutron activation.
d. nuclear emission.
e. beta decay.
[Ques. 2] The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is
a. nuclear fission.
b. nuclear fusion.
c. neutron activation.
d. nuclear emission.
e. beta decay.
[Ques. 3] How tightly the nucleons in a nucleus are bound together is indicated by the nucleus's
a. atomic number.
b. mass number.
c. neutron number.
d. half-life.
e. binding energy.
[Ques. 4] What do you do to the control rods of a reactor in order to shut it down?
a. push them into the core
b. pull them out of the core
c. nothingit's the cooling water that shuts down the reactor
d. none of the above
[Ques. 5] Which of the following is not a method of producing nuclear fusion?
a. heating a magnetically confined plasma
b. forcing nuclei together using lasers
c. cooling nuclei to very cold temperatures
d. forcing nuclei together with a nuclear fission explosion
[Ques. 6] The hydrogen in the universe was formed by
a. the energy of the Big Bang. b. nuclear fusion reactions in stars.
c. radioactive decay of heavy elements. d. none of the above.
[Ques. 7] Carbon-14 dating can be used to find the age of material up to ____________ of years old.
a. millions b. billions
c. hundreds of thousands d. tens of thousands
[Ques. 8] A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is
a. 3 minutes.
b. 4 minutes.
c. 6 minutes.
d. 8 minutes.
e. 12 minutes.
[Ques. 9] The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is
a. 35 years.
b. 70 years.
c. 125 years.
d. 140 years.
e. none of the above.
[Ques. 10] The time interval during which a nucleus has a 50 probability of decaying is its
a. half-life.
b. decay time.
c. nuclei activation time.
d. binding energy time.
e. none of the above.
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