Electromagnetic Waves

Question 1

The four characteristics of every wave are?

Answer 1

Wavelength, frequency, speed, and amplitude

Question 2

The physics units for frequency is the _______________ and is equal to 1 cycle per
second.

Answer 2

Hertz (Hz)

Question 3

What law governs the loss of intensity as distance from the wave source decreases?

Answer 3

Inverse square law

Question 4

If the wavelength of a homogeneous beam of x-rays was reduced to one half the
original wavelength, how would the number of waves striking you per second change?

Answer 4

The frequency would double since it is inversely proportional to wavelength

Question 5

List the seven types of
electromagnetic radiation in order from lowest energy to highest energy.

Answer 5

Radio < microwave < infrared < visible < ultraviolet < x-rays < gamma rays

Question 6

List the colors from lowest energy to highest energy.

Answer 6

Red, Orange, Yellow, Green, Blue, Indigo, and Violet (ROY G BIV)

Question 7

The speed of light (c) is _________.

Answer 7

3.0 x 10^8 m/s

Question 8

Frequency and wavelength are _______ proportional.

Answer 8

Inversely

Question 9

The energy of a photon is ________ proportional to its frequency

Answer 9

directly

Question 10

kVp is _______ proportional to the minimum wavelength of the beam.

Answer 10

inversely

Question 11

(R) Rydberg’s constant

Answer 11

13.6V

Question 12

The orbital
energy value corresponds to how strongly the negatively charged electron in that orbital is
attracted to the positively charged protons in the nucleus – also known as the ____ _____.

Answer 12

binding energy

Question 13

When an alpha particle is emitted from an atom of uranium, how does this change the atomic mass?

Answer 13

it decreases by four

Question 14

When gamma radiation is emitted from a radioactive atom, what happens to the atom’s Z number?

Answer 14

it remains unchanged

Question 15

What are the two differences between alpha particles and beta particles?

Answer 15

mass and charge

Question 16

As a result of Beta decay, an atom gains:

Answer 16

a proton

Question 17

The mass number “A” of an element is equal to the

Answer 17

number of nucleons in the nucleus

Question 18

One cycle per second is the definition for the unit:

Answer 18

hertz

Question 19

Different colors of light are electromagnetic waves with different:

Answer 19

wavelengths

Question 20

Diagnostic x-ray wavelengths range from:

Answer 20

one-tenth to one-half angstrom

Question 21

When considering electromagnetic waves, the higher the frequency, the:

Answer 21

shorter the wavelength

Question 22

The energy of an x-ray photon is directly proportional to its:

Answer 22

frequency

Question 23

The relationship between frequency, f,
wavelength, λ, and wave speed, v, is _=__.

Answer 23

v = f λ (c= Speed of Light for EMW)

Question 24

The energy of any photon is calculated using _=__

Answer 24

E = hf

Question 25

The energy of a photon is _____ proportional to its frequency.

Answer 25

Directly

Question 26

kVp is _______ proportional to the minimum wavelength of the beam.

Answer 26

Inversely

Question 27

A particularly useful variation of Planck’s formula for RadTech is ___=__/__

Answer 27

𝒌𝑽𝒑 = 𝟏𝟐.𝟒 / 𝝀

Question 28

R is Rydberg’s constant, __._V

Answer 28

13.6V

Question 29

For the hydrogen atom the
orbital energies can be calculated using the equation _ = _ / __

Answer 29

E electron = R / n^2

Question 30

Ground state energy level is…

Answer 30

n=1 , orbital closest to nucleus

Question 31

When the electron is pulled further from the nucleus it is “excited” and gains potential
energy - this process is called __________.

Answer 31

absorption

Question 32

When the electron loses energy, the
process is called _________.

Answer 32

emission