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March 2017 E-6 IT1 Exam > NAVEDTRA 14182A, Ch. 1 > Flashcards

NAVEDTRA 14182A, Ch. 1 Flashcards

1
Q

Which term means “movement through a medium”?

A

Propagation

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2
Q

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

A

Wave

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3
Q

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

A

Wave Motion

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4
Q

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?

A

Transverse

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5
Q

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

A

Longitudinal

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6
Q

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

A

Medium

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7
Q

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

A

Reference Line

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8
Q

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

A

Wavelength

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9
Q

Which unit of measurement are wavelengths expressed in?

A

Meters

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10
Q

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

A

Amplitude

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11
Q

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

A

Wave train

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12
Q

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?

A

Hertz

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13
Q

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

A

Hertz

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14
Q

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

A

Velocity

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15
Q

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

A

Period

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16
Q

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

A

Incident

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17
Q

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

A

Angle of reflection

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18
Q

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

A

Law of reflection

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19
Q

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

A

Diffraction

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20
Q

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?

A

Doppler Effect

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21
Q

How does sound travel through a medium?

A

Wave Motion

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22
Q

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

A

Sound

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23
Q

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

A

Sonics

24
Q

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

A

15 hertz

25
Q

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

A

Ultrasonic

26
Q

What are sounds below 15 hertz known as?

A

Infasonic

27
Q

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

A

Three

28
Q

Which two general groups may sounds be broadly classified into?

A

Noise or Tones

29
Q

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

A

Quality

30
Q

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

A

Pitch

31
Q

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

A

Intensity

32
Q

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

A

Loudness

33
Q

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

A

Elasticity and Density

34
Q

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

A

Elasticity

35
Q

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

A

Density

36
Q

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

A

1,087

37
Q

What is the science of sound referred to as?

A

Acoustics

38
Q

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

A

Echo

39
Q

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

A

Reverberation

40
Q

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

A

Noise

41
Q

What is light a form of?

A

Electromagnetic radiation

42
Q

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

A

Photons

43
Q

Approximately how many miles per second does light travel?

A

186,000

44
Q

What is a large volume of light called?

A

Beam

45
Q

What is a narrow volume of light called?

A

Pencil

46
Q

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

A

Transparent

47
Q

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

A

Translucent

48
Q

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

A

1675

49
Q

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

A

7.5

50
Q

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

A

Spectrum

51
Q

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

A

Antenna

52
Q

Which two primary components does an electromagnetic wave consist of?

A

Electric and Magnetic Field

53
Q

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

A

Photon

54
Q

Which units are used for measuring the wavelength of light?

A

Angstom

55
Q

What are the primary colors of light?

A

Red, green, and cyan

56
Q

What are the complementary colors of light?

A

Magenta, yellow, and cyan

57
Q

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

A

Interference

March 2017 E-6 IT1 Exam (83 decks)

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