NAVEDTRA 14182A, Ch. 1

Question 1

Which term means “movement through a medium”?

Answer 1

Propagation

Question 2

What can be defined as a disturbance (sound, light, radio waves) that moves through a medium (air,
water, vacuum)?

Answer 2

Wave

Question 3

What can be defined as a recurring disturbance advancing through space with or without the use of a
physical medium?

Answer 3

Wave Motion

Question 4

Which type of waves are water waves known as because the motion of the water is up and down, or at
right angles to the direction in which the waves are traveling?

Answer 4

Transverse

Question 5

Which type of waves are waves in which the disturbance takes place in the direction of propagation?

Answer 5

Longitudinal

Question 6

What is the vehicle through which the wave travels from one point to the next?

Answer 6

Medium

Question 7

What is the position called that a particle of matter would have if it were not disturbed by wave motion?

Answer 7

Reference Line

Question 8

What is the distance in space occupied by one cycle of a radio wave at any given instant?

Answer 8

Wavelength

Question 9

Which unit of measurement are wavelengths expressed in?

Answer 9

Meters

Question 10

Which wave property gives a relative indication of the amount of energy the wave transmits?

Answer 10

Amplitude

Question 11

What is a continuous series of waves called having the same amplitude and wavelength?

Answer 11

Wave train

Question 12

The number of vibrations, or cycles, of a wave train in a unit of time is called the frequency of the wave
train and is measured in what?

Answer 12

Hertz

Question 13

Which term refers to the number of occurrences that take place in one second?

Answer 13

Hertz

Question 14

Which propagation property is the rate at which the disturbance travels through the medium, or the velocity with which the crest of the wave moves along? (Page

Answer 14

Velocity

Question 15

What is the time in which one complete vibratory cycle of events occurs?

Answer 15

Period

Question 16

What is a wave called that is directed toward the surface of the mirror?

Answer 16

Incident

Question 17

What is the angle between the reflected wave and the normal called?

Answer 17

Angle of reflection

Question 18

Which law states that “The angle of incidence is equal to the angle of reflection”?

Answer 18

Law of reflection

Question 19

What is the bending of the wave path when the waves meet an obstruction?

Answer 19

Diffraction

Question 20

What is the apparent change in frequency or pitch when a sound source moves either toward or away from the listener, or when the listener moves either toward or away from the sound source?

Answer 20

Doppler Effect

Question 21

How does sound travel through a medium?

Answer 21

Wave Motion

Question 22

In the study of physics, what is defined as a range of compression-wave frequencies to which the human ear is sensitive?

Answer 22

Sound

Question 23

Which type of sounds are capable of being heard by the human ear?

Answer 23

Sonics

Question 24

The Navy has set an arbitrary upper limit for sonics at 10,000 hertz and a lower limit at what?

Answer 24

15 hertz

Question 25

What is it standard practice to refer to sounds above 10,000 hertz as?

Answer 25

Ultrasonic

Question 26

What are sounds below 15 hertz known as?

Answer 26

Infasonic

Question 27

How many basic elements for transmission and reception of sound must be present before a sound can be produced?

Answer 27

Three

Question 28

Which two general groups may sounds be broadly classified into?

Answer 28

Noise or Tones

Question 29

Sound has three basic characteristics: pitch, intensity, and what else?

Answer 29

Quality

Question 30

Which term is used to describe the frequency of a sound?

Answer 30

Pitch

Question 31

What is a measure of the sound energy of a wave?

Answer 31

Intensity

Question 32

What is the sensation the intensity (and sometimes frequency) the sound wave produces on the ear?

Answer 32

Loudness

Question 33

What are the two basic physical properties that govern the velocity of sound through the medium?

Answer 33

Elasticity and Density

Question 34

What is the ability of a strained body to recover its shape after deformation?

Answer 34

Elasticity

Question 35

What property of a medium or substance is the mass per unit volume of the medium or substance?

Answer 35

Density

Question 36

What is the velocity in FPS that sound will travel through air at 32 degrees F?

Answer 36

1,087

Question 37

What is the science of sound referred to as?

Answer 37

Acoustics

Question 38

What is the reflection of the original sound wave as it bounces off a distant surface called?

Answer 38

Echo

Question 39

In empty rooms or other confined spaces, sound may be reflected several times to cause what is known as what?

Answer 39

Reverberation

Question 40

What is the most complex sound wave that can be produced?

Answer 40

Noise

Question 41

What is light a form of?

Answer 41

Electromagnetic radiation

Question 42

Current light theory says that light is made up of very small packets of electromagnetic energy called what?

Answer 42

Photons

Question 43

Approximately how many miles per second does light travel?

Answer 43

186,000

Question 44

What is a large volume of light called?

Answer 44

Beam

Question 45

What is a narrow volume of light called?

Answer 45

Pencil

Question 46

Which type of substance is one through which you can see clearly?

Answer 46

Transparent

Question 47

What are substances called through which some light rays can pass but through which objects cannot be seen clearly because the rays are diffused?

Answer 47

Translucent

Question 48

Which year did Ole Roemer discover that light travels approximately 186,000 miles per second in space?

Answer 48

1675

Question 49

How many times in one second can a light beam circle the earth?

Answer 49

7.5

Question 50

Which term is used to designate the entire range of electromagnetic waves arranged in order of their frequencies?

Answer 50

Spectrum

Question 51

What is a conductor or a set of conductors used either to radiate electromagnetic energy into space or to collect this energy from space?

Answer 51

Antenna

Question 52

Which two primary components does an electromagnetic wave consist of?

Answer 52

Electric and Magnetic Field

Question 53

What is the smallest unit of radiant energy that makes up light waves and radio waves?

Answer 53

Photon

Question 54

Which units are used for measuring the wavelength of light?

Answer 54

Angstom

Question 55

What are the primary colors of light?

Answer 55

Red, green, and cyan

Question 56

What are the complementary colors of light?

Answer 56

Magenta, yellow, and cyan

Question 57

What is any disturbance, man-made or natural, that causes an undesirable response or the degradation of a wave referred to as?

Answer 57

Interference