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The Atomic Nucleus And Radioactivity
Test Description: Chapter 39 Hewitt conceptual physics text. subatomic structures and energy emmission
Instructions: Answer all questions to get your test result.
1) Two common products of unbound neutron decay are
A
another neutron and an electron
B
a proton and an electron
C
a proton and a gamma ray
D
an alpha particle and an electron
2) Which of the following is NOT emitted in radioactive decay
A
High-energy electromagnetic radiation
B
Alpha particles
C
Beta rays
D
All of the choices are emitted
3) The atomic number of an atom or ion refers to the number of
A
neutrons
B
electrons
C
protons
D
nucleons
4) The atomic mass number of an atom refers to the number of
A
electrons
B
protons
C
nucleons
D
neutrons
5) A sample of a certain radioactive material has ahalf life of 1 year. How much of this radioactive material will be left at the end of 3 years?
A
One half
B
All of it
C
One eighth
D
One quarter
6) When Uranium (92) ejects an alpha particle, the nucleus left behind has
A
90 protons
B
92 protons
C
91 protons
D
89 protons
7) Wehn thorium (90) ejects a beta particle, the resulting nucleus has
A
92 protons
B
90 protons
C
89 protons
D
91 protons
8) All elements beyond uranium in the periodic table
A
have no isotopes
B
are found naturally in the earth
C
have relatively short half lives
D
do not exist
9) Carbon-14 to radioactive and decays into
A
nitrogen-14
B
carbon-12
C
carbon-13
D
oxygen-14
10) The half life of carbon 14 is 5730 years. Suppose a basket was found that contains one half as much carbon 14 as a new basket of the same material. what is the approximate age of
A
716 years
B
5730 years
C
2865 years
D
1432 years
*select an answer for all questions
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