Exam 1 Part 3

Question 1

What is considered a rarefaction?

Answer 1

anti-nodes of these air molecules are points of decreased pressure and increased velocity

Question 2

What 3 forces slow and eventually stop the propagation of sound?

Answer 2

Inertia, elasticity, friction

Question 3

Wave motion that air molecules that vibrate, moving away from and back towards the source of sound; direction of particle motion is parallel to direction of propagation

Answer 3

Longitudinal wave motion

Question 4

direction of particle motion is perpendicular to direction of propagation; wave-like pattern that moves away from the impact in concentric waves

Answer 4

Transverse wave motion

Question 5

What is an example of a longitudinal wave?

Answer 5

Sound waves in air

Question 6

What is an example of a transverse wave?

Answer 6

a ripple on a pond, stadium wave

Question 7

The disturbance created by one single back-and-forth movement of the tuning fork

Answer 7

Cycle of vibration

Question 8

The number of cycles per second

Answer 8

Frequency (Hertz)

Question 9

The time it takes to complete one cycle

Answer 9

Period (s)

Question 10

refers to cycles of vibration that occur in the same amount of time

Answer 10

Periodic vibration

Question 11

refers to vibration cycles with various time periods.

Answer 11

Aperiodic vibration

Question 12

True or false: “During the vibration of the tines of a tuning fork, the forces of elasticity and intertia are simultaneously at work, but at different time one will be more dominant than the other.”

Answer 12

True

Question 13

True or false: “Air participles near the sound source vibrate and travel great distances, and this is how sound is tranferred through the medium.”

Answer 13

False

Question 14

The study of sound

Answer 14

Acoustics

Question 15

The tendency for motion or lack of motion to continue

Answer 15

Inertia

Question 16

The decrease in the amplitude of displacement over time

Answer 16

Damping

Question 17

The movement vibrating in a simple harmonic motion can be graphically represented as a…

Answer 17

Sine wave

Question 18

A type of wave in which particle movement is in the same direction as wave movement

Answer 18

Longitudinal wave

Question 19

A type of wave in which particle motion is perpendicular to wave movement

Answer 19

Transverse wave

Question 20

What are the 3 pre-requisites for producing sound?

Answer 20

A source of energy that is applied to, vibrating source, medium of transmission

Question 21

True or false: Both the vocal tract and the ear drum are reguarded as quarter-wave acoustic resonators.

Answer 21

True

Question 22

If two pure tones, that are 180 degrees out of phase with one another, are combined, the resulting signal will have which of the following characteristics

Answer 22

Silence

Question 23

When a tuning fork is struck, what is the resulting waveform called

Answer 23

Pure Tone

Question 24

True or false: Sound refers to the audible disturbance in a medium caused by a vibrating source.

Answer 24

True

Question 25

“A periodic sound wave is one that vibrates randomly with no repeatable pattern, while a aperiodic sound wave vibrates in a pattern.”

Answer 25

False