Chapter 3 Concepts

Question 1

Who developed the electromagnetic theory?

Answer 1

James Maxwell

Question 2

Characteristics of electromagnetic radiation (3)

Answer 2

has no mass,carries energy in waves as electric and magnetic disturbances in space, travels at the speed of light.

Question 3

Name lowest energy to highest energy on the electromagnetic spectrum

Answer 3

Radio Waves, Microwaves, Infrared Light, Visible Light, Ultraviolet Light, X-Rays, Gamma Rays.

Question 4

Wave lengths are measured in____

Answer 4

meters (m)

Question 5

Frequencies are measured in ____

Answer 5

hertz (Hz)

Question 6

Electromagnetic energy can exist apart from matter and travel through____

Answer 6

a vacuum

Question 7

There is a ______ relationship between frequency and energy

Answer 7

Direct. As frequency increases, energy increases.

Question 8

How does electromagnetic energy differ from mechanical energy?

Answer 8

It does not require a medium which to travel through. The energy itself vibrates.

Question 9

Electromagnetic energy can only exist as ____

Answer 9

photons

Question 10

The relationship between Wave length and Frequency is ________

Answer 10

Inverse. As the wave length decreases, the frequency increases.

Question 11

The speed of light in exponential form

Answer 11

3x10^8 m/s

Question 12

Electromagnetic radiation exhibits properties of ______ and ________

Answer 12

waves, and particles.

Question 13

_______act more like particles and ______ are more like waves

Answer 13

high energy, low energy

Question 14

The inverse square law is used to calculate what?

Answer 14

the change in the intensity (quantity) of radiation reaching the image receptor with changes is distance.

Question 15

What is the formula for the inverse square law?

Answer 15

i1 (d2)^2
—- = ———
i2 (d1)^2

Question 16

Where do Gamma Rays originate?

Answer 16

in the nuclei of atoms and they represent the excess energy the atom is giving off to reach a stable state.

Question 17

Where do X-Rays originate?

Answer 17

Through interactions between electrons and atoms.

Question 18

How are X-rays produced?

Answer 18

when fast moving electrons within the x-ray tube strike atoms of the metal in its target.

Question 19

What electromagnetic radiation is commonly used in MRI?

Answer 19

Radio waves.

Question 20

What is the unit for radioactive decay?

Answer 20

Curie/ Becquerel

Question 21

Where do beta particles originate?

Answer 21

an unstable nucleus

Question 22

What is a positron

Answer 22

It is a beta particle (aka electron) with a positive charge.

Question 23

What is an ion pair?

Answer 23

The atom and the electron that was removed from it during ionization.

Question 24

Subatomic make up of an alpha particle

Answer 24

2 protons and 2 neutrons

Question 25

Tera (T)

Answer 25

10^12

Question 26

Giga (G)

Answer 26

10^9

Question 27

Mega (M)

Answer 27

10^6

Question 28

Kilo (k)

Answer 28

10^3

Question 29

deci (d)

Answer 29

10^-1

Question 30

milli (m)

Answer 30

10^-3

Question 31

micro (weird looking u)

Answer 31

10^-6

Question 32

nano (n)

Answer 32

10^-9

Question 33

pico (p)

Answer 33

10^-12