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WorksheetsPhysical Science - Nuclear Energy
Total questions: 22
Worksheet time: 15mins
Name
Class
Date
1.
What is radioactivity?
a)
The movement of electrons around an atomic nucleus
b)
The emission of high-energy particles or waves from atoms
c)
A term that describes the forces that hold atomic nuclei together
d)
The application of heat energy to an atomic nucleus
2.
Which of the following best describes the process of nuclear fission?
a)
Splitting an atom's nucleus apart
b)
Separating an atom's electrons from its nucleus
c)
Fusing two atomic nuclei together
d)
Splitting an atom's electrons in half
3.
What would two different isotopes of an atom have in common?
a)
Number of neutrons
b)
Number of protons
c)
Atomic weight
d)
Atomic mass
4.
What is a half-life?
a)
The average time it takes for any element to disappear completely
b)
The time it takes for a radioactive atom to lose half its neutrons
c)
The time it takes for half of any number of radioactive atoms to decay
d)
The time it takes for a radioactive atom to lose half its electrons
5.
Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years?
a)
25,000
b)
50,000
c)
12,500
d)
0
6.
What happens when the number of protons in an atom changes?
a)
The number of electrons changes too
b)
Usually nothing happens, unless the atom is radioactive
c)
The atomic nucleus explodes
d)
It becomes a completely different atom, with different properties
7.
The time needed for half of a radioactive sample to decay is called its __________.
a)
decay period
b)
period
c)
transmutation time
d)
half-life
8.
How can radioactivity be useful?
a)
it can be used to microwave food
b)
It can be used in cancer treatments and pacemakers
c)
It can be used to create helpful gamma rays
d)
It can be used to create radioactive waste
9.
Fluorine has an atomic number of 9. What can you conclude about an atom of fluorine from this fact?
a)
It has nine protons
b)
It weighs nine grams
c)
It has nine electron shells
d)
It has a boiling point of 9 degrees Celsius
10.
In what part of an atom can protons be found?
a)
Inside the electrons
b)
Inside the neutrons
c)
Inside the atomic nucleus
d)
Inside the electron shells
11.
On the periodic table, how is atomic mass represented?
a)
As an average of the mass of different isotopes
b)
As the exact mass of every atom
c)
As the mass of the most common isotope
d)
As the masses of all the protons added together
12.
What do carbon-12 and carbon-14 have in common?
a)
They have the same number of protons
b)
They have the same number of neutrons
c)
They have the same atomic mass
d)
They have the same atomic weight
13.
How is carbon-12 different from carbon-14?
a)
They have a different number of protons
b)
They have a different number of electrons
c)
They have a different number of neutrons
d)
They are different elements
14.
What can you conclude about carbon-14 from its name?
a)
It has 14 electrons
b)
It has 14 neutrons
c)
It has 14 protons
d)
It has an atomic mass of 14
15.
Which type of nuclear radiation is being emitted here?
a)
Alpha
b)
beta
c)
gamma
d)
none
16.
The type of radioactive ray that will penetrate farthest into a material is a(n)__________. It is the most dangerous radioactive ray because of this.
a)
alpha
b)
beta
c)
gamma
d)
all of the above
17.
What type of radiation has a negligible mass and consists of high energy radiation?
a)
alpha
b)
beta
c)
gamma
d)
all of the above
18.
What does it mean when an element is radioactive?
a)
the atom emits radiation
b)
the nucleus is unstable due to an off balance ratio of protons to neutrons
c)
the nucleus changes to become stable
d)
all of the above
19.
How do atoms with stable nuclei differ from atoms with unstable nuclei? Nuclei is the plural of nucleus.
a)
The number of particles in stable nuclei never changes; the number of particles in unstable nuclei does change
b)
Stable nuclei contain equal numbers of protons and neutrons; unstable nuclei do not
c)
Stable nuclei emit electrons; unstable nuclei emit protons and neutrons
d)
Stable nuclei can be found everywhere; unstable nuclei do not occur in nature
20.
How many neutrons does uranium-239 have
a)
92
b)
147
c)
239
d)
331
21.
This is an example of...
a)
Fission reaction
b)
Fusion reaction
c)
Decomposition reaction
d)
Combustion
22.
Which type of radiation is being shown here
a)
Alpha
b)
Beta
c)
Gamma
d)
None of the above
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