Acoustics Flashcards

1
Q

Acoustics

A

Study of physical properties of sound

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2
Q

physical sound

A

frequency
intensity
timing
sensation of vibration

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3
Q

perception sound

A

auditory interpretation
how you experience sound in your brain
need physical sound

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4
Q

Waves

A

succession of molecules being shoved together and pulled apart
moving back and forth

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5
Q

compression/condensation

A

shoved together

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6
Q

rarefaction

A

pulled apart

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7
Q

transverse waves (perpendicular)

A

up and down

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8
Q

longitudinal waves (parallel)

A

back and forth
sound traveling through the ear

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9
Q

waveforms
(amplitude and time)

A

one complete compression and one complete rarefaction
cycle

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10
Q

amplitude

A

greatest distance the mass goes from resting position

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11
Q

peaks

A

compression
all squished together

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12
Q

simple sounds

A

all energy at one frequency

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12
Q

complex sounds

A

energy at more than one frequency

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12
Q

frequency

A

cycles/second
Measured in hertz

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12
Q

how fast does sound travel

A

340 m/sec through medium of air

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12
Q

wavelength formula

A

v/f

12
Q

velocity

A

speed of which sound travels
340 m/sec

13
Q

period

A

time required for each cycle
time/cycles or 1/frequency

14
Q

higher pitch =

A

more cycles per second

15
Q

2000 hz: how many cycles per second?

A

2000 cycles/second

16
Q

2000 hz: how long does it take for one cycle to occur?

A

1/2000 seconds

17
Q

length

A

as length increase, frequency decreases

18
Q

mass

A

as mass increases, frequency decreases

19
Q

stiffness

A

the flexibility of a mass
as stiffness increases, frequency increases

20
Q

low frequencies have _____ wavelengths

A

long
good at traveling around things

21
Q

high frequencies have ____ wavelengths

A

short

22
Q

amplitude determines

A

intensity (loudness)

23
Q

intensity

A

measure strength of sound
measured in power or pressure
greater force = greater intensity = greater amplitude

24
Q

how can intensity be expressed?

A

sound pressure or sound power

25
Q

decibel (dB)

A

unit of measure of intensity used in acoustics and audiometrics
1/10 of a bel

26
Q

frequency unit

A

hz

27
Q

frequency psychological

A

pitch

28
Q

intensity unit

A

dB

29
Q

intensity psychological

A

loudness

30
Q

duration unit

A

seconds

31
Q

duration psychological

A

how long something lasts

32
Q

phase

A

relationship between two or more waves

33
Q

what happens when a phase is 180 degrees?

A

it cancels sound out