Question 1

The source of the Earth's natural heat is

Accepted Answer

A) molten-hot lava. 
B) pressure on the Earth's interior. 
C) radioactive decay in the Earth's core. 
D) solar energy in the form of fossil fuels. 
A) molten-hot lava. 
B) pressure on the Earth's interior. 
C) radioactive decay in the Earth's core. 
D) solar energy in the form of fossil fuels. C

Question 2

The fate of the world's uranium supply is to eventually become

Accepted Answer

A) alpha and beta particles. 
B) iron. 
C) lead. 
A) alpha and beta particles. 
B) iron. 
C) lead. C

Question 3

When an element undergoes nuclear transmutation,the result is a completely different

Accepted Answer

A) isotope of the same element. 
B) ion of the same element. 
C) element. 
A) isotope of the same element. 
B) ion of the same element. 
C) element. C

Question 4

The atomic mass number of an element is the same as the number of its

Accepted Answer

A) protons. 
B) neutrons. 
C) nucleons. 
D) none of these 
A) protons. 
B) neutrons. 
C) nucleons. 
D) none of these

Question 5

When a beta particle is ejected from a nucleus,the nucleus then has slightly

Accepted Answer

A) greater mass and charge. 
B) greater mass and smaller charge. 
C) smaller mass and significantly greater charge. 
D) smaller charge and significantly greater mass. 
A) greater mass and charge. 
B) greater mass and smaller charge. 
C) smaller mass and significantly greater charge. 
D) smaller charge and significantly greater mass.

Question 6

The atomic number of an element is the same as the number of its

Accepted Answer

A) protons. 
B) neutrons. 
C) nucleons. 
D) neither of these 
A) protons. 
B) neutrons. 
C) nucleons. 
D) neither of these

Question 7

In order for an atom to decay to an element which is one greater in atomic number,it can emit

Accepted Answer

A) one alpha particle and 3 beta particles. 
B) one positron and 2 beta particles. 
C) one beta particle. 
D) all of these 
E) none of these 
A) one alpha particle and 3 beta particles. 
B) one positron and 2 beta particles. 
C) one beta particle. 
D) all of these 
E) none of these

Question 8

When thorium (A = 90)emits a beta particle,the resulting nucleus has atomic number

Accepted Answer

A) 88. 
B) 89. 
C) 90. 
D) 92. 
E) none of these 
A) 88. 
B) 89. 
C) 90. 
D) 92. 
E) none of these

Question 9

The helium in a child's balloon is composed of

Accepted Answer

A) alpha-particle remnants of previous radioactive processes. 
B) former beta particles. 
C) both of these 
D) none of these 
A) alpha-particle remnants of previous radioactive processes. 
B) former beta particles. 
C) both of these 
D) none of these

Question 10

A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second.If the Geiger counter is moved closer - to 0.5 meter from the source - what will the count rate be?

Accepted Answer

A) 25 counts/s 
B) 50 counts/s 
C) 100 counts/s 
D) 200 counts/s 
E) 400 counts/s 
A) 25 counts/s 
B) 50 counts/s 
C) 100 counts/s 
D) 200 counts/s 
E) 400 counts/s

Question 11

The most harmful radiations are those that

Accepted Answer

A) kill living cells. 
B) damage living cells. 
A) kill living cells. 
B) damage living cells.

Question 12

Once an alpha particle is outside the nucleus it is

Accepted Answer

A) free to wander about the nucleus. 
B) quickly bound to a neighboring nucleus. 
C) electrostatically repelled. 
D) radioactive. 
A) free to wander about the nucleus. 
B) quickly bound to a neighboring nucleus. 
C) electrostatically repelled. 
D) radioactive.

Question 13

The half-life of a radioactive substance is INDEPENDENT of

Accepted Answer

A) the number (if large enough)of atoms in the substance. 
B) whether the substance exists in an elementary state or in a compound. 
C) the temperature of the substance. 
D) the age of the substance. 
E) all of these 
A) the number (if large enough)of atoms in the substance. 
B) whether the substance exists in an elementary state or in a compound. 
C) the temperature of the substance. 
D) the age of the substance. 
E) all of these

Question 14

When a nucleus emits a beta particle,its atomic number

Accepted Answer

A) remains constant,but its mass number changes. 
B) remains constant,and so does its mass number. 
C) changes,but its mass number remains constant. 
D) changes,and so does its mass number. 
E) none of these 
A) remains constant,but its mass number changes. 
B) remains constant,and so does its mass number. 
C) changes,but its mass number remains constant. 
D) changes,and so does its mass number. 
E) none of these

Question 15

Electric forces within an atomic nucleus tend to

Accepted Answer

A) hold it together. 
B) push it apart. 
C) neither of these 
A) hold it together. 
B) push it apart. 
C) neither of these

Question 16

The half-life on an isotope is one day.At the end of three days,how much of the isotope remains?

Accepted Answer

A) none 
B) one-half 
C) one-quarter 
D) one-eighth 
E) none of these 
A) none 
B) one-half 
C) one-quarter 
D) one-eighth 
E) none of these

Question 17

The operation of a cloud chamber relies on

Accepted Answer

A) magnetization. 
B) evaporation. 
C) acceleration. 
D) polarization. 
E) condensation. 
A) magnetization. 
B) evaporation. 
C) acceleration. 
D) polarization. 
E) condensation.

Question 18

An element emits 1 alpha particle,1 positron,and 3 beta particles.Its atomic number

Accepted Answer

A) decreases by 2. 
B) decreases by 1. 
C) stays the same. 
D) increases by 1. 
E) increases by 2. 
A) decreases by 2. 
B) decreases by 1. 
C) stays the same. 
D) increases by 1. 
E) increases by 2.

Question 19

Carbon dating requires that the object being tested contain

Accepted Answer

A) organic material. 
B) inorganic material. 
C) charcoal. 
D) sugar molecules. 
E) none of these 
A) organic material. 
B) inorganic material. 
C) charcoal. 
D) sugar molecules. 
E) none of these

Question 20

It's impossible for a hydrogen atom to emit an alpha particle.

Accepted Answer

A) True 
 B)False

Exam 33: Atomic Nucleus and Radioactivity

The source of the Earth's natural heat is

The fate of the world's uranium supply is to eventually become

When an element undergoes nuclear transmutation,the result is a completely different

The atomic mass number of an element is the same as the number of its

When a beta particle is ejected from a nucleus,the nucleus then has slightly

The atomic number of an element is the same as the number of its

In order for an atom to decay to an element which is one greater in atomic number,it can emit

When thorium (A = 90)emits a beta particle,the resulting nucleus has atomic number

The helium in a child's balloon is composed of

A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second.If the Geiger counter is moved closer - to 0.5 meter from the source - what will the count rate be?

The most harmful radiations are those that

Once an alpha particle is outside the nucleus it is

The half-life of a radioactive substance is INDEPENDENT of

When a nucleus emits a beta particle,its atomic number

Electric forces within an atomic nucleus tend to

The half-life on an isotope is one day.At the end of three days,how much of the isotope remains?

The operation of a cloud chamber relies on

An element emits 1 alpha particle,1 positron,and 3 beta particles.Its atomic number

Carbon dating requires that the object being tested contain

It's impossible for a hydrogen atom to emit an alpha particle.

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