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WorksheetsUnstable Nucleus and Radioactive Decay
Total questions: 25
Worksheet time: 9mins
Name
Class
Date
1.
How is the alpha particle written in a nuclear equation?
a)
42He
b)
24He
2.
The neutron-to-proton ratio of an atom's nucleus determines its stability.
a)
True
b)
False
3.
Unstable nuclei lose energy by emitting radiation in a spontaneous process called radioactive decay.
a)
False
b)
True
4.
Which radiation is deflected to the negatively charged plate?
a)
Alpha Radiation
b)
Beta Radiation
5.
Which radiation has the highest penetrating power?
a)
alpha
b)
gamma
c)
beta
6.
Which radiation has the lowest penetrating power?
a)
alpha
b)
beta
c)
gamma
7.
Which type of radioactive decay produces only energy and no mass change?
a)
alpha decay
b)
beta decay
c)
gamma decay
8.
What is emitted during Beta Radiation?
a)
A high-energy Electron.
b)
Protons.
c)
Neutrons.
d)
Nuclei
9.
Uranium-238 decays into Thorium-234 by emitting .........
a)
an alpha particle
b)
a beta particle
c)
gamma rays
d)
visible light
10.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
11.
After the third half-life, how much of a radioactive sample is left?
a)
1/2
b)
1/3
c)
1/16
d)
1/8
12.
Protons and neutrons is so small, they are assigned a mass of 1 in these units
a)
grams
b)
milligrams
c)
amu (atomic mass unit)
d)
mass number
13.
If a nucleus after beta decay is 23491Pa, what was the nucleus just before the release of the beta particle?
a)
23492U
b)
23891Pa
c)
23591Pa
d)
23490Th
14.
In the reaction 2411Na →2412Mg + X, particle X is a
a)
A) positron
b)
B) electron
c)
C) proton
d)
D) neutron
15.
What is the major drawback to fission power?
a)
Radioactive Waste
b)
CO2 Emissions
c)
SO2 Emissions
d)
All of the Above
16.
How do you calculate the mass per nucleon if you know the mass of a particular nucleus?
a)
Add the number of nucleons to the mass of nucleus
b)
Multiply mass of nucleus by the number of nucleons in it
c)
Divide number of nucleons by the mass of nucleus
d)
Divide mass of nucleus by the number of nucleons in it
17.
___________ starts the fission of a uranium atom.
a)
Energy
b)
Protons
c)
One Neutron
d)
All of the above
18.
Which of the following is true about nuclear fission?
a)
The mass of the product is greater than the mass of the original nucleus
b)
The mass of the product is less than that of the original nucleus
c)
The mass of the product is the same as the mass of the original nucleus
d)
The mass of the product is 100 times greater than the original nucleus
19.
What is a chain reaction?
a)
When electrons travel are emitted causing electricity
b)
When a nuclear fission reaction occurs, the protons emitted can strike other nuclei in the sample, and cause them to split
c)
When a nuclear fission reaction occurs, the neutrons emitted can strike other nuclei in the sample, and cause them to split
d)
When a nuclear fission reaction occurs, the electrons emitted can strike other nuclei in the sample, and cause them to split
20.
What is a beneficial aspect of nuclear fission?
a)
The ability to absorb energy
b)
The ability to release tremendous amounts of energy
c)
The ability to produce more energy than nuclear fusion
d)
There are no beneficial aspects of nuclear fission
21.
What is true about nuclear fusion?
a)
The mass of the product is less than that of the original nucleus
b)
The mass of the product is 100 times less than that of the original nucleus
c)
The mass of the product is the same as that of the original nucleus
d)
The mass of the product is greater than that of the original nucleus
22.
The rate at which a radioactive element decays is its ____.
a)
quarter life
b)
whole life
c)
wonderful life
d)
half life
23.
Most of the alpha particles went straight through the gold foil. This suggested that....
a)
There is no interference between alpha and gold.
b)
Most of the atom is made up of empty space.
c)
The alpha particles were very tiny.
d)
None of the above
24.
Some of the alpha particles fired at the gold foil were deflected at angles. This was due to...
a)
reflection of the alpha source when it it the fluorescent screen.
b)
The alpha particles hitting the gold nucleus.
c)
Repulsion forces between the positively charged nucleus and the positively charged alpha particles.
d)
A mis-firing of the alpha source
25.
What quantities vary between isotopes of an element?
a)
protons, electrons, and atomic mass
b)
protons, electrons, and atomic number
c)
neutrons and electrons
d)
neutrons and atomic mass
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