Section 21.1
Types of Radioactivity
Practice Test
1.
Radioactivity is the spontaneous emission of radiation by a/an ________________.
a.
covalent bond
b.
hydrogen bond
c.
stable electron
d.
unstable atomic nucleus
Hint
2.
After a/an ________________ substance is exposed to light, it continues to give off the light it has absorbed.
a.
fluorescent
b.
organic
c.
phosphorescent
d.
radioactive
Hint
3.
In an ionizing smoke detector, smoke particles interfere with the flow of ions created by _____________ from americium-241.
a.
alpha particles
b.
atoms
c.
electrons
d.
gamma rays
Hint
4.
_____________ produces a form of high-energy electromagnetic radiation.
a.
Alpha decay
b.
Beta decay
c.
Delta decay
d.
Gamma decay
Hint
5.
This portable device detects radioactivity and contains a battery and a gas-filled cylinder.
a.
cyclotron
b.
film badge
c.
Geiger counter
d.
scintillation counter
Hint
6.
This radioactive isotope is commonly used to determine the age of once-living organisms.
a.
carbon-14
b.
nitrogen-14
c.
oxygen-16
d.
sodium-23
Hint
7.
The half-life of technetium-99 is 6.0 hours. How much of a 1.000-gram sample remains after 18.0 hours?
a.
0.125 g
b.
0.250 g
c.
0.500 g
d.
8.000 g
Hint
8.
Given that the half-life of carbon-14 is 5730 years, how old is a fossilized organism that contains 25.0% of the carbon-14 it did when it was alive?
a.
5730 y
b.
11 460 y
c.
17 190 y
d.
22 920 y
Hint
9.
Which of the following types of radiation will pass directly through an electric field without being deflected?
a.
alpha particle
b.
beta particle
c.
delta ray
d.
gamma ray
Hint
10.
Unstable atomic nuclei emit radiation to __________.
a.
attain more stable atomic configurations
b.
gain electrons
c.
gain neutrons
d.
lose protons
Hint
11.
If a thorium-230 atom undergoes alpha decay, what are the products of the reaction?
a.
actinium and an alpha particle
b.
actinium and a positron
c.
radium and an alpha particle
d.
radium and a positron
Hint
12.
The half-life for tritium is 12.32 years. How long will it take for a 10.00-g sample of tritium to decay until 1.875 g remain?
a.
0.6594 years
b.
5.333 years
c.
24.64 years
d.
30.80 years
Hint
