Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Acoustics > Chapter 1 > Flashcards

Chapter 1 Flashcards

1
Q

Vibration

A

Any form of to and fro motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Sound

A

A perceived aural psychological sensation produced by vibration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Sine wave

A

A graph of the simplest form of vibration showing motion in time/space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Sine tone

A

The sound produced by sinusoidal vibration or oscillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Synthesizer

A

An electronic music instrument that uses select tones, amplifiers and filters to create new musical sounds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Simple harmonic motion definition/perception/graph

A

Simplest kind of vibration/pure tone/sine wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Periodic motion

A

Pendulum repeats motion in equal intervals even though distance traveled gets shorter and shorter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Pendulum motion is fastest where?

A

At its center point of rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Pendulum motionless where?

A

Each extreme

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Elasticity

A

Tendency of a displaced body to return to its point of rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Momentum

A

Tendency of a displaced body to overshoot its point of rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Frequency

A

Number of cycles in a fixed period of time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Acoustical definition of frequency

A

Number of sound waves passing a given point in one second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Frequency is measured in

A

Hertz (Hz)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Resonant frequency

A

Frequency at which a body tends to vibrate due to its natural characteristics of size, shape, molecular composition, and the stress the body is under

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Pitch

A

Our perception of frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The greater the frequency the (higher/lower) the perceived pitch

A

higher

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Amplitude

A

The distance through which a vibrating body moves. i.e. the amount of displacement of a vibrating body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Loudness

A

Our perception of amplitude

20
Q

The greater the amplitude the (louder/softer) the perceived sound

A

louder

21
Q

(T/F) Humans do not perceive sound equally well at all frequencies

A

True

22
Q

Average range of human sound perception

A

20 Hz-20,000 Hz

23
Q

Hearing loss

A

The inability to perceive certain frequencies and amplitudes which are within the common limits of perception

24
Q

Cent

A

One hundredth of a chromatic semitone

25
Q

Cent is the most common unit to describe…

A

amount of pitch deviation

26
Q

High frequencies require (more/less) power to be heard than low frequencies

A

less

27
Q

Decibel

A

A unit of sound intensity

28
Q

How much energy is needed to produce a sound twice as loud?

A

10x

29
Q

Decibel measurements are based on an average…

A

threshold of audibility

30
Q

Threshold of audibility is determined by…

A

taking 1000 Hz frequency and reducing amplitude to the point where it is inaudible (0 dB)

31
Q

Sound intensity pain threshold is roughly…

A

120 dB

32
Q

Transmitting media

A

A transmitter of vibration from a sound source to a receiver (ear or microphone)

33
Q

Mediums must be _____ for vibration to take place

A

elastic

34
Q

Compression

A

A point in space where a number of molecules which have been set into motion in effect bunch up causing an unusual number of molecules to occupy the same space

35
Q

Rarefaction

A

A point at which the usual number of molecules which occupy a given space are temporarily out of position, causing a partial vacuum to occur

36
Q

Reflection

A

The bouncing back of sound waves as they strike a surface more dense than that in which they are traveling

37
Q

Echoes

A

Sound waves which have been reflected

38
Q

Resonance

A

The transmission of vibration from one body to another

39
Q

To resonate, the frequency of the first body must be _______ the natural frequency of the second body

A

exact or very nearly

40
Q

Sympathetic vibration

A

excitation of a second sound source

41
Q

Sounds and music are possible as a result of…

A

consistency of natural, predictable, physical laws

42
Q

As people age, their _____ frequency limit gets _____

A

upper, lower

43
Q

Stroboscope

A

Alternating light/dark squares which rotate at a set speed for a given frequency; neon bulb flashes at a tone’s exact frequency that is played into it

44
Q

(Solids/air) are/is more efficient transmitting media

A

Solids

45
Q

Dissipation

A

weaking of sound waves as they travel outward through space

46
Q

Absorption

A

rampant reflection that occurs within tiny surfaces of fibrous material, fostering quick dissipation

Acoustics (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions