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AR 2222-UTIL 02 > Module 1 - The Science of Acoustics: Man, Space and Sound > Flashcards

Module 1 - The Science of Acoustics: Man, Space and Sound Flashcards

1
Q

the art and technique of designing spaces, structures and mechanical systems to ______

A

Architectural acoustics
meet hearing needs

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2
Q

the art and science of designing a room or building that insures both _____ & ______, and provide special features as to purpose and use of bldg.

A

comfort, communications

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3
Q

give the three main objectives for acoustics in bldgs:
1. ______ echoes & _______ the best distribution of sound thru the study of the _____ of the room & estimation of the amount of ________ needed.
2. _______ sound thru proper insulation
3. ________ machines & _____

A
  1. To control echoes and to secure the best distribution of sound through the study of the shape of the room and the estimation of the amount of sound absorbing material needed.
  2. To reduce sound from one room to another through proper insulation.
  3. To isolate machines and other noise producing equipment.
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4
Q

In summary, the objective of architectural acoustics is to ________ to be heard and to __________ to a point where it does not cause annoyance.

A

To allow wanted sound; to mask unwanted sound

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5
Q

The oscillation in pressure of the atmosphere which is capable of being detected by the human ear.

A

Sound

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6
Q

Form of energy propagated in waves which continues to subsist until filtered through a material turning into heat by friction.

A

Sound

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7
Q

Sound is the sensation produced through the ear resulting from fluctuations in the __________-

A

pressure of the air

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8
Q

The nature of sound requires three elements:

A
  1. source of sound
  2. Medium or transmission path
  3. Receiver
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9
Q

_______ is normally a vibrating body, which converts some other form of energy into vibration.

A

Source of Sound

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10
Q

T/F
The source of sound can be made quieter

A

True

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11
Q

_____ is often used as a generic term for devices used in converting some form of energy into sound.

give examples

A

Transducer
examples: loudspeakers and microphones

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12
Q

_______ is any substance that allows the vibration to be transmitted in the form of a wave motion.

A

Transmission path

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13
Q

T/F
The transmission cannot be made to transmit more or less sound.

A

False. (can)

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14
Q

________ sounds that are transmitted by air

A

Airborne Sounds

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15
Q

__________ sounds that are transmitted through solid bodies.

A

Structure borne sounds

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16
Q

It pertains with the human ear

A

Receiver

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17
Q

T/F
The receiver can be influenced.

A

True

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18
Q

What are the types of sound?

A

Music
Speech
Noise

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19
Q

Sounds organized to have melody, rhythm, harmony and dynamics.

A

Music

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20
Q

To express with the voice.

A

Speech

21
Q

These types of sound can be classified as ordered sounds since they are integrated

A

Music & Speech

22
Q

Loud and harsh kind of sound. Classified as disordered sound.

A

Noise

23
Q

_____ are longitudinal wave motion with which sound energy travels through a medium.

A

Sound waves

24
Q

Sound waves are ___________ waves. They require _______ of their medium’s molecules or particles.

A

Mechanical; vibrations

25
Q

Sound can/cannot travel through a vacuum

A

cannot

26
Q

T/F
The lower the amplitude, the quieter sound is.

A

True.
Low Amplitude = quiet
High Amplitude = louder

27
Q

The full circuit by the particle

A

cycle

28
Q

Number of complete cycles per measured in Hertz (Hz)

A

Frequency

29
Q

T/F
the amplitude of vibration of a sound wave determines its pitch. The higher the frequency of the sound wave, the higher is its pitch.

A

True. (directly proportional)

30
Q

The maximum displacement of a particle to either side of its normal position during vibration.

A

amplitude

31
Q

The time required for one complete vibration, measured in seconds per cycle

A

Period

32
Q

What are the 7 properties of sound? (SFPSoPTaTpDoss)

A
  1. Speed or Velocity
  2. Frequency (Pitch or Tone)
  3. Power (Intensity or Loudness)
  4. Sound Pressure
  5. Threshold of Audibility
  6. Threshold of Pain
  7. Directionality of Sound Sources
33
Q

Sound travels at ______ meters per second at normal temperature (20 deg Celcius)

A

330 m/s

34
Q

T/F
Sound travels slower in denser media

A

False. (faster in denser media like liquids and solids than in air)

35
Q

T/F
Sound travels faster through air at 30 deg Celsius than at -17 deg Celsius

A

True

36
Q

T/F
Aluminum has a higher speed of sound than brick.

A

True
Aluminum (5,540)
Brick (3,450)

37
Q

T/F
Concrete has a higher speed of sound than water.

A

True.
Concrete (3,500)
Water (1,350)

38
Q

Often referred to by Pitch. The number of variations in cycles per second, Hertz (Hz)

A

Frequency

39
Q

The approximate frequency range of a person’s hearing is ______.

A

20 to 20,000 Hz

40
Q

Humans are most sensitive to sounds with frequency at _____.

A

500 to 4,000 Hz

41
Q

The male voice has a frequency of _____, while the female voice has a frequency of ______.

A

Male voice: 350 to 550 Hz
Female voice: 700 to 900 Hz

42
Q

Also known as Sound Power Level.
It is a sound’s intensity, loudness or pressure against the eardrum.

Measured in ______.

A

Power.
Unit is decibels (dB)

43
Q

_____ represents the threshold of perfect human hearing.

A

0 dB

44
Q

T/F
An increase in 3 dB represents doubling of sound intensity.

A

True

45
Q

A whisper is ____ dB

A

15

46
Q

Normal speech is ___ dB

A

60

47
Q

Talking is ___ dB while shouting is ___.

A

75; 90

48
Q

Threshold of Pain is ____ dB

A

120

AR 2222-UTIL 02 (5 decks)

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