8/21 Quiz

Question 1

which nucleus atom determines identity of element

Answer 1

protons

Question 2

what determines atomic mass

Answer 2

protons and neutrons

Question 3

Which statement BEST describes the amount of energy
required to
remove an electron from a given orbital?
a.
Exceeds the electrostatic force of attraction.
b. Magnitude related to
greater distance from nucleus.
C. Lost energy in the form of electromagnetic radiation.
d. Lowest principal quantum number, then lowest angular
momentum.

Answer 3

exceeds electrostatic force of attraction

Question 4

what is the specific balance between the positively charged nucleus and the surrounding negatively charged electons called

Answer 4

binding energy

Question 5

didnt get question 5

Question 6

loosely bound electrons can be displaced by which low energy radiation

Answer 6

ultraviolet

Question 7

linear energy transfer (LET) of particulate radation refers to

Answer 7

rate of loss of energy

Question 8

give examples of ionizing electromagnetic radiation

Answer 8

xrays, gamma rays, UV rays

Question 9

what is a property of electromagnetic waves

Answer 9

travel at the velocity of light in a vacuum

Question 10

what are the primary components of xray machine

Answer 10

xray tube and power supply

Question 11

which component of the xray machine is necessary in order to generate and accelerate electrons

Answer 11

power supply

Question 12

which is the source of electrons within the xray tube

Answer 12

filament

Question 13

the number of electrons emitted is determiend by what

Answer 13

temperature of filament

Question 14

the focusing cup is made of

Answer 14

molybdenum

Question 15

which is the purpose of the target in an xray tube

Answer 15

convert K.E. of fast moving electrons to x rays

Question 16

All are characteristics of ideal target material EXCEPT one. Which one is the exception?
a. High melting point.
b. High vapor pressure.
c. High atomic number.
d. High thermal conductivity.

Answer 16

high vapor pressure

Question 17

what is the purpose of rotating anode

Answer 17

dissipate heat from small focal spot

Question 18

why is the target angled

Answer 18

to reduce the size of focal spot (effective focal spot) but still maintain the same heat dissipation (line focus principle)

Question 19

what is the flow of electrons from the cathode filament, across the tube to the anode, and then back to the filament called?

Answer 19

tube current

Question 20

which x-ray machine control regulates the filament temperature?

Answer 20

milliamperage (mA)

Question 21

which is an advantage of a constant-potential x-ray machine over a self-rectifying x-ray machine, given a voltage and radiographic density setting

Answer 21

more efficient use of electricity

Question 22

which xray machine control limits the durationof xray production

Answer 22

exposure time

Question 23

which is the primary form of radiation produced from an intraoral x-ray tube

Answer 23

Bremmstrahlung

Question 24

when an electron from the filament directly hits the nucleus of a target atom, which entity is produced

Answer 24

Brehmsstrahlung

Question 25

Which statement does NOT explain the continuous spectrum of x-ray photons?
a. Accelerated electrons form characteristic radiation.
b. Deflected electrons give up varying amounts of energy.
Electrons striking the target have varying levels of kinetic energy.
d. Electrons participate in many bremsstrahlung interactions
before losing all their kinetic energy.

Answer 25

accelerated electrons form characteristic radiation

Question 26

which occurs when an electron is ejected from its orbital by an incident electron

Answer 26

characteristic radiation

Question 27

Doubling the exposure time will result in which occurrence?
a. Doubling the range of photon energies.
b. Doubling the number of photons generated.
C. Decreasing by half the x-ray emission spectrum.
d. Decreasing by half the number of electrons produced.

Answer 27

b. Doubling the number of photons generated.

Question 28

The beam intensity is affected by all factors EXCEPT one.
Which one is the EXCEPTION?
a. Collimation.
b. Exposure time.
C. Tube current (mA).
d. Tube voltage (kVp).

Answer 28

collimation

Question 29

what is the purpose of dental x-ray machine filtration

Answer 29

eliminate low-energy photons

Question 30

a photoelectric interaction is MOST LIKELY to occur when photons interact with which tissue

Answer 30

NO ANSWER