Ch 3 Electromagnetic Energy

Question 1

the properties of electromagnetic energy are:

Answer 1

frequency, wavelength, velocity & amplitude

Question 2

*A photon is the smallest quantity of ____

Answer 2

any type of electromagnetic energy

Question 3

quantum is:

Answer 3

a small bundle of energy

Question 4

photon have __amu

Answer 4

0 amu (no mass)

Question 5

*velocity of all electromagnetic radiation is:

Answer 5

3x10^8 m/s

Question 6

*AMPLITUDE is ___

Answer 6

one half the range from crest to valley over which the sine wave varies, how high or low it is, tells you the peak of kVp

Question 7

*FREQUENCY is ___

Answer 7

the number of wavelength that pass a point per second, (rate of rise to fall), measurement is hertz (Hz)

Question 8

1 Hz =

Answer 8

1 cycle per second

Question 9

*WAVELENGTH is ____

Answer 9

the distance from one point to the next corresponding point on a sine wave, from crest to crest or valley to valley

Question 10

3 wave parameters are:

Answer 10

velocity (constant), frequency, wavelength

Question 11

*At any given velocity, frequency and wavelength are:

Answer 11

inversely proportional

Question 12

*Diagnostic ultrasound is___

Answer 12

not part of the electromagnetic spectrum

Question 13

visible light is described by___ and measured in __

Answer 13

wavelength, nanometers (nm)

Question 14

*The energy of a photon is:

Answer 14

directly proportional to its frequency

Question 15

refraction:

Answer 15

the deviation in a line of travel

Question 16

the colors of white light:

Answer 16

have varying wavelengths ranging from 400nm for violet to 700nm for red

Question 17

infrared light:

Answer 17

heats any substance that is shines on, is considered radiant heat

Question 18

ultraviolet light:

Answer 18

causes molecular interactions that can cause sunburn

Question 19

RF has:

Answer 19

relatively low energy and long wavelengths

Question 20

*visible light is identified by ___
radio frequency is identified by ___
x-rays are identified by ___

Answer 20

wavelength
frequency
energy

Question 21

*Photons interact with matter most easily:

Answer 21

when the matter is approximately the same size as the photons wavelength

Question 22

visible light interacts with:

Answer 22

living cells (roads & cones)

Question 23

ultraviolet light interacts with:

Answer 23

molecules

Question 24

x-rays interact with:

Answer 24

electrons and atoms

Question 25

*X-rays behave as though they are:

Answer 25

particles

Question 26

*visible light behaves like a:

Answer 26

wave

Question 27

*electromagnetic energy attenuation is the:

Answer 27

reduction of intensity that results from scatter and absorption (attenuation=scatter+absorption)

Question 28

when light waves are absorbed, the energy absorber reappears as:

Answer 28

heat

Question 29

transparent:

Answer 29

light is transmitted almost unaltered

Question 30

translucent:

Answer 30

light is still transmitted but greatly scattered and reducesd in intensity, blurred

Question 31

opaque:

Answer 31

light is totally absorbed

Question 32

*electromagnetic energy intensity is:

Answer 32

inversely related to the square of the distance from the source

Question 33

*the inverse square law can be applied to distances:

Answer 33

greater than 7 times the longest dimension of the source

Question 34

*photon energy is _____ to the photon frequency

Answer 34

directly proportional

Question 35

the longer the wavelength of electromagnetic energy, the:

Answer 35

lower the energy of each photon

Question 36

energy absorbed that is not ionized becomes:

Answer 36

heat

Question 37

if amplitude goes up, frequency ____

Answer 37

goes down

Question 38

energy and frequency are:

Answer 38

proportional

Question 39

the kVp range of diagnostic x-rays is:

Answer 39

30-150 kVp

Question 40

the only units of energy are:

Answer 40

eV, J & erg

Question 41

frequency and wavelength are:

Answer 41

inversely proportional

Question 42

with electromagnetic radiation, the _____ field and the _____ field are _______

Answer 42

electric, magnetic, perpendicular sine waves