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Unit 4 Review

Total questions: 50

Worksheet time: 13hrs 30mins

Name
Class
Date
1.
In order of most to least penetrating radiation we have
a)
Alpha , Beta,  Gamma
b)
Beta , Gamma , Alpha
c)
Gamma, Beta, Alpha
d)
Gamma, Alpha, Beta
2.
What type of radiation can be stopped by a piece of paper?
a)
Alpha radiation
b)
Beta radiation
c)
Gamma radiation
3.
What type of radiation can be stopped by a 5 mm piece of aluminium?
a)
Alpha radiation
b)
Beta radiation
c)
gamma radiation
4.
What type of radiation can be stopped by a thick lead sheet?
a)
Alpha radiation
b)
Beta radiation
c)
gamma radiation
5.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
6.
Name the most penetrating type of radiation.
a)
alpha
b)
beta
c)
gamma
d)
lambda
7.
Name the instrument used to detect radioactivity.
a)
voltmeter
b)
ohmeter
c)
seismograph
d)
geiger counter
8.
When does radioactive decay occur?
a)
When the nucleus of an isotope is unstable
b)
When the nucleus of an isotope is stable
c)
When the electrons of an isotope are spinning
d)
When the electrons of an isotope are shared with another isotope
9.
Alpha particles.....
a)
a) are positively charged.
b)
b) consist of two protons and four neutrons.
c)
c) can penetrate any thickness of matter
d)
d) All of the above 
10.

When a nucleus undergoes gamma decay, the atomic number of the element....

a)

remains the same

b)

decreases by one.

c)

increases by one.

d)

increases by two.

11.
Radioactive materials have unstable...
a)
electrons
b)
protons
c)
nuclei
d)
neutrons
12.
Negatively charged particles emitted from a nucleus at a high speed are ____.  
a)
alpha particle
b)
gamma rays
c)
beta particles
d)
X rays
13.

Which type of nuclear radiation is being emitted here?

a)

Alpha

b)

beta

c)

gamma

d)

none

14.
Positively charged particles that consist of two protons and two neutrons are called
a)
alpha particles
b)
beta particles
c)
gamma rays
d)
neutron emissions
15.

If we start off with element 5024X, and alpha decay occurs we get another element [Y] that looks like....

a)

5022Y

b)

4622Y

c)

4820Y

d)

5426Y

16.
Which type of nuclear radiation is being emitted here?
a)
alpha
b)
beta
c)
gamma
d)
none
17.

Identify the missing substance in each of the following nuclear reactions.

_____→13756 Ba + 0−1B

a)

13755Ba

b)

13757La

c)

13856Ba

d)

13755Cs

18.

Which of the following elements is formed when an alpha particle is emitted from 24395Am?

a)

Uranium

b)

Radium

c)

Plutonium

d)

Neptunium

19.

For the following nuclear reaction, what is the identity of particle [X]?

X → 86Rn222 + 2He4

a)

Astatine

b)

Radon

c)

Francium

d)

Radium

20.
What is the penetrating rays and particles emitted by a radioactive source?
a)
Radiation
b)
Radioactivity
c)
Radioisotopes
21.
What is the process by which nuclei emit particles and rays?
a)
Radiation
b)
Radioactivity
c)
Radioisotopes
22.
When small nuclei combine to produce a nucleus of greater mass
a)
Fusion
b)
Fission
c)
Chain Reaction
23.
The splitting of a nucleus into smaller fragments accompanied by the release of neutrons and a large amount of energy
a)
Fusion
b)
Fission
c)
Chain Reaction
24.
It is the energy producing reaction that takes place in our sun and other stars.
a)
Fission
b)
Chain Reaction
c)
Fusion
25.
When neutrons produced react with other fissionable atoms, continuing the fission.
a)
Fission
b)
Chain Reaction
c)
Fusion
26.
The energy produced can be controlled and harnessed to produced electricity.
a)
Chain Reaction
b)
Fission
c)
Fusion
27.

Lable R

a)

Alpha

b)

Beta

c)

Gamma

28.
Nuclear Power's source comes from _________________.
a)
Uranium or Plutonium
b)
Coal
c)
Natural Gas
d)
Oil and/or Coal
29.
The three types of radiation associated with nuclear disintegration are ____________, _____________, and _____________.
a)
alpha, beta, and gamma
b)
alpha, beta, and half-life
c)
beta, gamma, and half-life
d)
beta, gamma, and delta
30.
When moving neutrons hit the nuclei of certain other atoms thereby causing them to disintegrate, and this happens repeatedly, it is said to be a _______________________.
a)
nuclear chain reaction
b)
alpha radiation
c)
nuclear half-life
d)
control rod
31.
What product does a nuclear power plant produce for its customers?
a)
electricity
b)
a turbine
c)
hot water
d)
steam
32.
How is the alpha particle written in a nuclear equation?
a)
42He
b)
24He
33.
Uranium-238  decays into  Thorium-234  by emitting .........
a)
an alpha particle
b)
a beta particle
c)
gamma rays
d)
visible light
34.
Balance the following equation:
146C --> 0-1e + ________
a)
145B
b)
146C
c)
147N
d)
42He
35.
The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____.
a)
the daughter product
b)
geologic time
c)
the half-life
d)
the half-time
36.
The graph shows the radioactive decay of a 50-gram sample of a radioactive isotope. 
 According to the graph, what is the half-life of this isotope? 
a)
100 years
b)
150 years
c)
200 years
d)
300 years
37.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
a)
0.25g
b)
2.5g
c)
25g
d)
80g
38.
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
39.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
40.
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?
a)
16g
b)
32g
c)
0.0625g
d)
4g
41.

What is the mass number of this isotope?

a)

131

b)

53

c)

184

d)

78

42.

What is the atomic number of this isotope?

a)

131

b)

53

c)

184

d)

78

43.

How many protons does this isotope have?

a)

131

b)

53

c)

184

d)

78

44.

When a substance undergoes beta decay

a)

The atomic number increases by 1

b)

The atomic number decreases by 2

c)

The atomic number does not change

45.

A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?

a)

1

b)

2

c)

3

d)

4

46.

How much of a 250g sample would be left after 5 half lives?

a)

125g

b)

62.5g

c)

31.25g

d)

7.81g

47.
Neutrons released in a fission reaction can strike other nuclei and cause a 
a)
meltdown
b)
take down
c)
break down
d)
chain reaction
48.
The process by which nuclei having small masses are united to form a single larger nucleus is called nuclear ____.
a)
fusion
b)
fission
c)
reactivity
d)
waste
49.

Which describes the beta particle?

a)

2 protons and 2 neutrons

b)

positively charged

c)

only energy

d)

the electron emitted from a neutron that split into a proton and an electron

50.

What is this symbol?

a)

alpha decay

b)

beta decay

c)

gamma decay

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