Audio Frequency range of humans

Pitch is the subjective term for Frequency

Human speech is mainly in the range

Prolongation of the sound in the room caused by continued multiple reflections

Bass sound is considered

Treble sound is considered

The sound energy transferred per second from the noise source to the air

Sound pressure converted to the decibel scale

The human impression of the strength of a sound

Used to absorb the vibration of the generator base

Expressed in units called watts (W)

One octave increase doubles the frequency

A logarithmic scale applicable to any parameter

Safe exposure limit for human reception for eight hours a day

Bending or “flowing” of a sound wave around an object or through an opening

The fraction of the randomly incident sound power which is absorbed, or otherwise not reflected

Ceiling that can diffuse sound

Scattering or random redistribution of a sound wave from a surface

Absorbs sound and keeps it too (thermal storage)

Absorbs sound and transmits excess sound to the next room

A single-number index for rating how absorptive a particular material is

A value given in decibels, which is determined by measuring sound pressure levels at a certain frequency in the source and receiving rooms

Sound reflected on two-focus points

Sound reflected on one focus points

A reflection with magnitude and delay

Caused by repetitive reflections off hard surfaces

This is a single-number rating of a material’s or assembly’s barrier effect

Material with the lowest STC rating

Material with the highest STC rating

A type of lighting system which is inherently efficient; basically all light is directed downward

A type of lighting system where walls and ceiling must have a high-reflectance finish

A type of lighting system that employs a translucent diffusing element through which the downward component shines

A type of lighting system where fixtures distribute approximately an equal amount of light upward and downward

A type of lighting system where the minor upward component serves to illuminate the ceiling

A type of light fixture with translucent or semi-transparent (see-through) covers made of glass or plastic; bottom or sides of light fixtures to control brightness

A type of light fixture with baffles that shield the bulb from view and reflect light; can be contoured to control light and decrease brightness

A type of light fixture with clear, transparent glass, plastic covers; incorporates prisms and flutes to distribute light in specific ways

A lighting source that closely replicates natural sunlight can be considered as light source

The most practical method of passive solar energy utilization in commercial buildings

Directional lighting to emphasize a particular object or draw attention to a display item

Provides an area with overall illumination; provides fairly uniform lighting

Allows the user to adjust and control lighting and provides flexibility for each user

A type of light fixture that uses diffusers, lenses and louvers to cover bulbs from direct view to prevent glare and distribute light

Has an upward and downward light distribution of equal percentage

Meaning of LED

A type of light used for stadiums and billboards

A type of light used for outdoor parking

A type of light used for indoor parking

Which is not a High Intensity Discharge Lamp

Has a tube, starter and a ballast with low mercury vapor

Has a filament and glass bulb

An energy saving light that has 8,000 hours life span

An energy saving light that has 50,000 hours life span

Light has a distinctive deep yellow light output

Light has a distinctive blue-green light

A color of light used for T12 and other fluorescent lamps

A color of light used for incandescent bulbs

Meaning of ESL

Meaning of SSL