Question 1

The distance from the crest of one wave to the crest of another wave is called the frequency.The wavelength of a wave is the number of oscillations per unit of time.

Accepted Answer

A)  Both statements are true.
B)  Both statements are false.
C)  First statement is true,second is false.
D)  First statement is false,second is true. B

Question 2

Ultrasonic radiation is part of the electromagnetic spectrum,and has no effect on tissue.

Accepted Answer

A)  Both statements are true.
B)  Both statements are false.
C)  The first statement is true,the second is false.
D)  The first statement is false,the second is true. D

Question 3

The difference in the electromagnetic spectrum between x-rays and visible light lies in the:

Accepted Answer

A)  energy.
B)  wavelength.
C)  subatomic particles.
D)  weightlessness of the waves. B

Question 4

Identify the metal used in the focal spot of the x-ray tube:

Accepted Answer

A)  iron.
B)  copper.
C)  tungsten.
D)  molybdenum.

Question 5

The release of electrons from the hot tungsten filament at the cathode is called the thermionic emission effect.

Accepted Answer

A) True 
 B)False

Question 6

Ionization occurs:

Accepted Answer

A)  when an atom loses a proton.
B)  when the atom has no charge.
C)  when an atom gains a neutron.
D)  when an atom loses an electron.

Question 7

All of the following are the basic elements of an x-ray tube needed to produce x-rays EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

A)  High voltage
B)  The production of heat
C)  A target to stop the electrons
D)  A source of electrons within the tube.

Question 8

Federal regulations require that all dental x-ray machines have which of the following?

Accepted Answer

A)  An audible signal in addition to the signal lights in the control panel when an exposure is being made.
B)  A light in the control panel that signals when an exposure is being made.
C)  An audible signal when an exposure is being made.
D)  There are no federal regulations in this area.

Question 9

The total x-ray energy produced by the collision of the electrons with the target inside the x-ray tube is approximately:

Accepted Answer

A)  less than 1%.
B)  10%-20%.
C)  50%.
D)  99%.

Question 10

Each of the following are properties of x-rays EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

A)  x-rays are invisible.
B)  x-rays travel in wavy lines.
C)  x-rays can penetrate structures.
D)  x-rays can adversely affect human tissues.

Question 11

The amount of heat produced in the x-ray tube is less than the amount of radiation produced.

Accepted Answer

A) True 
 B)False

Question 12

Each of the following are examples of particulate radiation EXCEPT one.Which one is the EXCEPTION?

Accepted Answer

A)  Neutrons
B)  Electrons
C)  Alpha particles
D)  Gamma particles

Question 13

The duty rating refers to the number of consecutive seconds a machine can be operated before it overheats,and the duty cycle refers to the portion of every minute that the dental machine can be used without overheating.

Accepted Answer

A)  Both statements are true.
B)  Both statements are false.
C)  The first statement is true,the second is false.
D)  The first statement is false,the second is true.

Question 14

The tungsten filament in the x-ray tube is found at the cathode.

Accepted Answer

A) True 
 B)False

Question 15

Particulate radiations are most commonly emitted from radionuclides.

Accepted Answer

A) True 
 B)False

Question 16

Identify the particles that compose the nucleus of an atom:

Accepted Answer

A)  electrons and photons.
B)  electrons and protons.
C)  protons and neutrons.
D)  neutrons.

Question 17

The target or focal spot in the x-ray tube can be found at the:

Accepted Answer

A)  positively charged anode.
B)  negatively charged anode.
C)  positively charged cathode.
D)  negatively charged cathode.

Question 18

In a stable atom the number of orbiting electrons (-)equals the number of protons (+)in the nucleus.Therefore,the atom is electrically neutral.

Accepted Answer

A)  Both statements are true.
B)  Both statements are false.
C)  The first statement is true,the second is false.
D)  The first statement is false,the second is true.

Question 19

Electromagnetic spectrum is a grouping of electrons.

Accepted Answer

A) True 
 B)False

Exam 1: The History of Ionizing Radiation and Basic Principles of X-Ray Generation

The distance from the crest of one wave to the crest of another wave is called the frequency.The wavelength of a wave is the number of oscillations per unit of time.

Ultrasonic radiation is part of the electromagnetic spectrum,and has no effect on tissue.

The difference in the electromagnetic spectrum between x-rays and visible light lies in the:

Identify the metal used in the focal spot of the x-ray tube:

The release of electrons from the hot tungsten filament at the cathode is called the thermionic emission effect.

Ionization occurs:

All of the following are the basic elements of an x-ray tube needed to produce x-rays EXCEPT one.Which one is the EXCEPTION?

Federal regulations require that all dental x-ray machines have which of the following?

The total x-ray energy produced by the collision of the electrons with the target inside the x-ray tube is approximately:

Each of the following are properties of x-rays EXCEPT one.Which one is the EXCEPTION?

The amount of heat produced in the x-ray tube is less than the amount of radiation produced.

Each of the following are examples of particulate radiation EXCEPT one.Which one is the EXCEPTION?

The duty rating refers to the number of consecutive seconds a machine can be operated before it overheats,and the duty cycle refers to the portion of every minute that the dental machine can be used without overheating.

The tungsten filament in the x-ray tube is found at the cathode.

Particulate radiations are most commonly emitted from radionuclides.

Identify the particles that compose the nucleus of an atom:

The target or focal spot in the x-ray tube can be found at the:

In a stable atom the number of orbiting electrons (-) equals the number of protons (+) in the nucleus.Therefore,the atom is electrically neutral.

Electromagnetic spectrum is a grouping of electrons.