WorksheetsAcoustics A-Z
Total questions: 30
Worksheet time: 22mins
The science of Sound. Its production, transmission and effects. The branch of physics that treats the phenomena and laws of sounds as it affects people.
ACOUSTICS
LIGHTING
ARCOUSTIC
ECHOSTIC
The acoustical characteristics of a space or room influenced by the amount of acoustical absorption, or lack of it in the space.
ACOUSTICAL ENVIRONMENT
ACOUSTICAL SURROUNDING
ACOUSTICAL SPACE
ARCHITECTURAL ACOUSTICS
Noise that arrives at a point of interest by propagation through the air.
AIRBORNE NOISE
AIRBORNE SOUND
Sound that reaches the point of interest by propagation through air.
AIRBORNE SOUND
AIRBORNE NOISE
Deals with sound in rooms and building to make them quiet – or to provide improved conditions for listening and understanding speech or music.
ARCHITECTURAL ACOUSTICS
BIOACOUSTICS
MEDICAL ACOUSTICS
MUSICAL ACOUSTICS
The properties of a material composition to convert sound energy into heat thereby reducing the amount of energy that can be reflected.
ABSORPTION
REFLECTION
REFRACTION
DIFFUSION
The reduction of sound energy as a function of distance travelled.
ATTENUATION
REFRACTION
REFLECTION
ABSORPTION
Noise level in a space from all sources such as HVAC or extraneous sounds from outside the space. Masking sound or low-level background music can contribute to ambient level of sound or noise.
AMBIENT NOISE/SOUND
DIRECT NOISE/SOUND
The sum total of all noise generated from all direct and reflected sound sources in a space that can represent an interface to good listening and speech intelligibility.
BACKGROUND NOISE
NOISE
A free hanging acoustical sound absorbing unit. Normally suspended vertically in a variety of patterns to introduce absorption into a space to reduce reverberation and noise levels.
(a)
Anything physical or an environment that interferes with communication or listening. A poor acoustical environment can be a barrier to good listening and especially so for persons with a hearing impairment.
(a)
A measurement of sound intensity named in honor of Alexander Graham Bell. First used to relate intensity to a level corresponding to hearing sensation.
(a)
Low frequency reflections. In small rooms acoustical panels with air space behind can better help control low frequency reflectivity.
(a)
In acoustical industry terms, an acoustical panel suspended in a horizontal position from ceiling/roof structure. Similar to a baffle but in a horizontal position.
(a)
In acoustics, the cycle is the complete oscillation of pressure above and below the atmospheric static pressure.
(a)
The number of oscillations that occur in the time frame of one second. (See FREQUENCY.) Low frequency sounds have fewer and longer oscillations.
CYCLES PER SECOND
CYCLES PER MINUTE
CYCLES
CYCLES PER SOUND
The dissipation of vibratory energy in solid media and structures with time or distance. It is analogous to the absorption of sound in air.
DAMPING
MASKING
Sound level as a logarithmic ratio. Sound intensity described in dB.
Breathing - 5 dB
Office activity - 50 dB
Jet aircraft during take-of at 300’ distance - 130 dB
DECIBEL
DYESIBEL
DRUM
SABIN
The scattering or random reflection of a sound wave from a surface. The directions of reflected sound is changed so that listeners may have sensation of sound coming from all directions at equal levels.
DIFFUSION
REFLECTION
DIFFUSION
DIFFRACTION
Reflected sound producing a distinct repetition of the original sound. Echo in mountains is distinct by reason of distance of travel after original signal has ceased.
ECHO
REVERBERATION
Short echoes in a small reverberative spaces that produce a clicking, ringing or hissing sound after the original sound signal has ceased. Flutter echoes may be present in long narrow spaces with parallel walls.
(a)
Sound waves from a source outdoors where there are no obstructions.
FREE FIELD
FAR FIELD
NEAR FIELD
OPEN FIELD
The number of oscillations or cycles per unit of time. Usually expressed in units of Hertz (Hz) where one Hz is equal to one cycle per second.
(a)
Frequency of sound expressed by cycles per second.
(a)
The sound produced by the collision of two solid objects. Typical sources are footsteps, dropped objects, etc., on an interior surface (wall, floor, or ceiling) of a building.
(a)
Sound levels fall off with distance travelled. Sound level drops off 6 dB from source point for every doubling of distance.
INVERSE SQUARE LAW
DIRECT SQUARE LAW
REVERSE SQUARE LAW
The average deviation above and below the static value due to sound wave is called sound pressure. The energy expended during the sound wave vibration is called intensity and is measured in intensity units. Loudness is the physical resonance to sound pressure and intensity.
(a)
The process by which the threshold of hearing of one sound is raised due to the presence of another.
(a)
Unwanted sound that is annoying or interferes with listening. Not all noise needs to be excessively loud to represent an annoyance or interference.
(a)
The amount of sound wave energy (sound) that is reflected off a surface. Hard non-porous surfaces reflect more sound than soft-porous surfaces. Some sound reflection can enhance quality of signal of speech and music.
(a)
