NAVEDTRA 14182A, NEETS Mod. 10, Ch. 1 Flashcards Preview

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Flashcards in NAVEDTRA 14182A, NEETS Mod. 10, Ch. 1 Deck (57)
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1

Which term means "movement through a medium"?

Propagation

2

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

Wave

3

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

Wave motion

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?

Transverse

5

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

Longitudinal

6

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

Medium

7

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

Reference line

8

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

Wavelength

9

Which unit of measurement are wavelengths expressed in?

Meters

10

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

Amplitude

11

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

Wave train

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?

Hertz

13

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

Hertz

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?

Velocity

15

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

Period

16

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

Incident

17

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

Angle of reflection

18

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

Law of reflection

19

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

Diffraction

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?

Doppler Effect

21

How does sound travel through a medium?

Wave motion

22

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

Sound

23

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

Sonics

24

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

15 hertz

25

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

Ultrasonic

26

What are sounds below 15 hertz known as?

Infrasonic

27

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

Three

28

Which two general groups may sounds be broadly classified into?

Noise or Tones

29

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

Quality

30

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

Pitch