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Building Systems and Interiors II study guide

Terms in this set (20)

A unit of measurement for sound pressure, intensity or power
Decibel
What is the name for a Lisener's perception of the frequency of a pure tone?
Pitch
What is the name for the fraction of an incident sound that bounces off a material?
Reflectance
What is the name for the fraction of an incident sound that is turned into heat within a material?
Absorption
A 10 dB increase represents a perceived loudness increase of:
Twice as much
Reverberation times for small to medium spaces designed to facilitate speech should fall between:
0.4 - 0.8 seconds
The physical principle underlying free-field sound propagation is:
The Inverse Square Law
The minimum threshold of human hearing occurs at 0 decibels.
True
Reverberation is defined as:
A persistence of sound in a space after the sound source has stopped.
In the process known as sound absorption, sound is converted into:
Heat
What does Reverberation Time measure?
The time it takes for a sound to drop 60 dB.
NRC is a good indication of a material's ability to absorb sound at all frequencies.
False
A material with a NRC of 0.10 is more absorbent than one rated at 0.75
False
STC is a single number rating that expresses:
The transmission loss of a material or construction assembly
"Flanking" describes the ability of sound to:
Find the path of least resistance.
There is more diffraction with low frequency sounds than with high
True
In auditorium spaces, seat upholstery and audience members significantly contribute to the sound absorption of the space.
True
What is the name for a sound that is reflected between parallel surfaces of a space
Flutter Echo
Which of the following is desirable for music performances as it spreads the sound evenly over a wide seating area:
Diffusion
An interior designer would like to specify a new porous material for a manufacturing space but it must absorb sound from a machine that produces low frequency. As a professional she should do which of the following:
Check the material's absorption coefficient for the particular frequency that the machine emits.
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