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Subatomic Physics
Test Description: Holt physics chapter 25
Instructions: Answer all questions to get your test result.
1) The nucleus of an atom is made up of
A
protons and neutrons
B
protons, electrons, and neutrons
C
electrons and neutrons
D
electons and protons
2) Light nuclei are stable when
A
they contain more neutons than protons
B
the coulomb force is stronger than the nuclear force
C
they conatain more protons than neutrons
D
they contain equal numbers of protons and neutrons
3) Samples of 2 different isotopesx & y both contain the same number of radioactive atoms. X has a half-life twice that of Y. How do their rates of radiation compare?
A
X has a smaller rate than Y
B
X has a greater rate than Y
C
Rate depends on atomic number, not half-life
D
Rates of X and Y are equal
4) In fission reactions, the binding energy per nucleon must ______ atomic number
A
increase; increasing
B
decrease; increasing
C
remain constant; increasing
D
remain constant; decreasing
5) In order to adequately control a chain reaction, it is necessary to have within the fissionable material a nonfissionable material that _________ neutrons.
A
reflects
B
emits
C
absorbs
D
contributes
6) How is a fission reaction different from a fusion reaction?
A
there is less radioactive waste
B
the transportation of fuel is safer
C
the fuel is cheaper
D
the fuel must be processed
7) Which interaction of nature holds the planets, stars, and galaxies together, even though its effect on elementary particles is negligible?
A
weak
B
storn
C
gravitational
D
electromagnetic
8) Which of the following do physicists believe are fundamental particles?
A
6 quarks and 6 leptons
B
6 quarks and 3 leptons
C
3 quarks and 6 leptons
D
3 quarks and 3 leptons
9) During the radiation era of the big bang theory, most energy was in the form of radiation. What form did matter take?
A
ions and electrons
B
electrons
C
ions
D
hydrogen atoms
10) A radioactive material initially is observed to have an activity of 800 counts/s. If 4 h later it is ovserved to have an activity of 200 counts/s, what is its half-life?
A
8 hour
B
2 hour
C
4 hour
D
1 hour
*select an answer for all questions
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