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Waves > #2 > Flashcards

#2 Flashcards

1
Q

Sound def

A

Can travel through any solid, liquid, or gas

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2
Q

Sound will travel through solids ??

A

Fasted because the particles are all connected

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3
Q

Sound will travel through gasses ??

A

Easiest because the particles are small

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4
Q

Sounds are caused by what

A

By anything vibrating and causing molecules next to it to vibrate

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5
Q

More compression equals

A

High pressure

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6
Q

Rerefractiin equals

A

Low pressure

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7
Q

Eardrums feel pressure change and what

A

Send electrical signals to brain

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8
Q

Wavefrom def

A

A graph of the pressure changes cause by sound

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9
Q

Two types of times

A

1) pure tone

2) complex tone

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10
Q

Pure tone def

A

Only 1 tone is produced

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11
Q

Complex tone def

A

More than 1 tome @ the same time

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12
Q

Majority of Musical instruments are

A

Complex

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13
Q

Noise def

A

Random waveform
Does not repeat
Has no definite wavelength or frequency

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14
Q

People can hear what

A

20-20,000 Hz

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15
Q

Below 20Hz is called

A

Infrasound

-subwoofer

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16
Q

Above 20,000Hz is called

A

Ultrasound

- doh whistle

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17
Q

Sound propagation def

A

The movement of sound waves

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18
Q

The amplitude decreases as the wave

A

Expands

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19
Q

In open space, the amplitude is

A

Proportional to 1/d

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20
Q

Reverberation def

A

Process of repeated reflections of sound

21
Q

Reverberant sound def

A

Sound heard after the original sound pulse

22
Q

Reverberant time def

A

How long it takes for the sound amp to decrease by a factor of 1,000

23
Q

Reverberation can cause

A

Distortion in sound

- sound and speech have pauses but reverberation can fill those pauses

24
Q

Tone quality def

A

How a sound sounds

25
Q

Every instrument out there produces a

A

Unique time due to limits of construction

26
Q

Pitch def

A

Perception of Highness or lowness of tone

27
Q

The pitch depends mostly on

A

The frequency of the wave

28
Q

A note in a certain octave has twice the what

A

The frequency of the same note on an octave below

29
Q

Pythagoras def

A

Discovered if 2 notes have a simple whole # ratio, they are in harmony

30
Q

Loudness def

A

Depends on the amplitude of a wave

31
Q

“Normal” sound pressure is

A

1/1,000,000 of an ATM

32
Q

How much does the eardrum vibrates compared to the diameter of an atom in the normal sound

A

100X the diameter

33
Q

What is the faintest sound

A

1/1,000,000,000 of an ATM

34
Q

The eardrum vibrates how much in the faintest sound

A

Eardrum vibrates less than diameter of an atom

35
Q

What is the average diameter of atom ?

A

1 X 10 -8 cm

36
Q

Sound level def

A

Measured in decibels(dB)

37
Q

How many decibels is the classroom ?

A

50 dB

38
Q

A sound with 10X the amp has a sound leve, of how many dB

A

20 dB higher

39
Q

Quietest Sound =

A

0 dB

40
Q

Pain threshold =

A

120 dB

41
Q

An increase or 1 dB makes sound

A

Noticeably louder

42
Q

67-68 =

A

Louder

43
Q

67-67.6 =

A

Can’t tell

44
Q

Increase of 10 dB makes sound

A

Twice as loud

45
Q

90-100 =

A

Twice as loud

46
Q

90-110 =

A

4x as loud

47
Q

Two sounds of equal dB combine to make a sound of

A

3 dB higher

48
Q

10 similar sounds =

A

Twice as loud

Waves (2 decks)

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