SOUNDS Flashcards
Vibrations that travel through the air or another medium and can be heard when they reach a person’s or animal’s ear
Vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid, or solid
A physical wave or a series of pressure vibrations
SOUNDS
Frequency is measured in cycles per second, or ____, named after German physicist Heinrich Rudolf Hertz
HERTZ
The faster an object vibrates, the higher the frequency, then the higher the pitch of the sound
TRUE
The ____ of a sound is the frequency of its vibration
PITCH
It is the strength of the sensation received through ear
LOUDNESS
It is the characteristic of the sound which distinguishes it from another sound of some loudness and pitch
TONE QUALITY
The more vibrations per second, the higher the frequency and sound pitch
TRUE
The fewer vibrations per second, the lower the frequency and sound pitch
TRUE
Sound per unit area
SOUND INTENSITY
Distance between the resting position of the crest of a wave
How loud the sound is
AMPLITUDE
The pitch of the sound
FREQUENCY
The intensity/loudness of sound is measured in ____
Decibels (dB)
Decibels are logarithmic scale, not a linear scale.
TRUE
Normal conversation is ___ dB.
40-60 dB
Exposure to sounds louder than ___ dB can cause damage to the hearing
85 dB
Sound at __ dB is uncomfortable and can cause immediate damage
120 dB
___ dB is the threshold of pain. Also known as noise-induced hearing loss
140 dB
How sounds travel:
Sounds hit a surface and bounces back off of it
REFLECTION
How sounds travel:
Sounds hit a surface and some of it is absorbed
ABSORPTION
How sounds travel:
Sound that isn’t absorbed or reflected passes through the material, such as a wall
TRANSMISSION
A surface that is rigid, flat and smooth usually reflects sound. The reflection of sound on a surface follows the behavior of reflected light, meaning that the angle of incidence is equal to the angle of reflection.
TRUE
One characteristic of sound is that it can bend around an obstruction known as ___________
DIFFRACTION OF SOUND
When a sound comes from a source, the hearer of the sound actually hears two types of sounds:
From the source and directly delivered to the hearer
DIRECT OR ORIGINAL SOUND
When a sound comes from a source, the hearer of the sound actually hears two types of sounds:
From all directions of the room
REFLECTED SOUND
Sound travels much faster in liquids and solids than it does on air
TRUE
As sound travels much slower than the speed of light, the resulting defects in many rooms are ____ and ____.
ECHOES
REVERBERATIONS
When the reflected sound which reaches the observer is delayed more than 0.058 seconds relative to the direct sound, they are distinguished as _____
ECHOES
________ consists of successive reflections of sounds in a room
REVERBERATION
_______ is what happens to a body when another vibrating body vibrates and initiates the other body to vibrate in harmony with it
RESONANCE
The quality found in different materials that reduce reverberation times by absorbing sound energy and reducing sound levels
SOUND ABSORPTION
Soft and porous materials absorb more sound
Fiber glass absorbs most sound
Concrete absorbs the least sound
TRUE
Buildings with sound absorption are vulnerable to excessive reverberation
FALSE. Buildings WITHOUT sound absorption are the ones vulnerable to excessive reverberation
The property in a wall that allows it to keep noise from passing from one side to the other by absorbing sound waves of different frequencies
Blocks or absorbs sounds. It is versatile and used in many spaces
SOUND INSULATION
_______ absorb sound, minimizing noise from adjacent spaces
ACOUSTICAL BOARD
_________ in office buildings are designed to foster collaboration and remove barriers between employees, such as office walls and cubicle barriers
OPEN CONCEPT SPACES
Three challenges of architectural acoustics:
- CONTROLLING NOISE POLLUTION
- DEALING WITH ENVIRONMENTAL NOISE
- PREDICTING SOUND DISTRIBUTION
