Is a physical wave, a mechanical vibration, a series of pressure variations, in an elastic medium Sound

A healthy pair of human ear has a detection range of. 20 to 20000 HZ

Sound travels in air, at sea level, in ____ m/sec. 344 m/ sec.

The number of times the cycle of compression and rarefaction of air makes in a given unit of time. Frequency

Is the persistence of sound after the cause of sound has stopped-a result of repeated reflections. Reverberation

Is caused when reflected sound at sufficient intensity reaches a listener approximately 70 m/ sec. after hear the direct sound. Echo

Is perceived as a buzzing or clicking sound, and it is comprised of repeated echoes traversing back and forth between two non-
Flutter
absorbing parallel surfaces.

A device used for sound absorption Fibrous Materials

This describe the reflection of sound along a curved surface near the surface Creep

Sound travels only about ___________m/sec. 344 m/sec

It is the measurement of the intensity of sound. decibel

It is the limit for comfortable hearing. 40 db

Reverberation
It is the time in seconds that a reflected sound diminishes for the case by 60db after the original sound has stopped.
time

omnidirectional
It is a type of microphone which equally sensitive sound arriving at it from any direction
mic

It has a stimulating effect, conducive to drinking, induces sleep, best for bars and night club. incandescent

In theory and fundamentals of lighting. It is the science that deals with measurement of light. photometry

It refers to the unit of intensity of light of one standard candle whose light is concentrated at a point and the light source is
candle power
assumed to be placed at the center of a hollow sphere of one foot radius.

In physical principles of light, it is the light rays leaving the source strike through, opaque surface which spreads the light in
Diffusion
various directions, in addition light is broken up while in reflection, the light bounces back at a different direction.
It is the unit of luminous flux, amount f light falling on a surface from the source. Lumen

the reciprocal of
Mho as used in electrical systems calculation is defined as _______.
ohm

A unit of mechanical power is horsepower.What is electrical power? Watt

In lighting and illumination calculation, what is the unit for lux? 1 lumen per sq.m.

Varies inversely
In Inverse Square Law, it states that: “sound intensity ______ the square of the distance from the source.”
with

Is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to
Decibel
a specified or implied reference level.

An apparent shift in the frequency occurring when an acoustic source and listener are in motion relative to each other, the
droppler effect
frequency increasing when the source and the listener approach each other and decreasing when they move apart

What is a repetitious reflective sound due to parallel walls? flutter

delayed sound heard a fraction of a second after the direction of sound isheard Echo

unpleasant or unwanted sound Noise

What is the study of reactions of humans to audible sound? psycho acoustics

environmental
study of effects on environment upon audible sound
acoustics –

study of sound generated by equipment electro acoustics

What is the distance between two similar points in succession waves traveling in one cycle? wavelength

rate of repetition of a periodic phenomenon frequency –

a sensation felt by the brain resulting from the distance of molecules in the air sound –

What is the amount of sound energy produced by the source? magnitude

unit of loudness of sound decibel

at speed of sound normal temperature and pressure velocity –

What is the reflected sound that gathers in a central portion of the room? sound foci

one characterized by large amounts of absorption dead room

characterized by very small amounts of absorption Live room

What is the persistence of sound after the source of sound has stopped? reverberation
state existing in a system which is set into oscillation resonance

simplest kind of sound composed entirely of sound waves of a single frequency pure tone –

Specific Lighting
A type of lighting that provides illumination to special objects like sculptures, flower arrangements, etc.

Phon
Unit of loudness level.

Sound Absorption
The process of dissipating sound energy by converting it to heat.

Wavelength
Distance sound travels during each cycle of vibration.

Sound
Attenuation
The reduction in the intensity or in the sound pressure level of sound which is transmitted from one point to another.

Sabin
Unit of sound absorption equivalent to 1 square foot of perfectly absorptive material.

Sound Diffraction
Acoustical phenomenon which causes sound wave to be bent or scattered around
Threshold of
Minimum sound pressure level that is capable of being detected by the human ear Audibility

Sound
Fluctuation in pressure, a particle displacement in an elastic medium.

Pure Tone
Sound sensation in a single frequency.

Sine Wave
Wave produced by a pure tone.

Luminaire
Synonymous with a lighting fixture.

Candela
The luminous intensity of light is expressed in ___.

General Lighting
Type of lighting dealing with relatively large area lighting.

Luminous Flux
The rate of flow of light through a surface.

Luminance
The luminous intensity of any surface in a given direction per unit of projected area.

Foot-Candle
A unit of illumination equivalent to 1 lumen per square foot.

Lux
A unit of illumination equivalent to 1 lumen per square meter

Indirect Lighting
Type of lighting system where 90-100% of light output is directed to the ceiling and upper walls of the room

Cathode
The equivalent of filament in a fluorescent lamp.

Sound Intensity
The rate of flow of sound energy

Accent Lighting
Lighting used primarily to draw attention to particular points of interest.

Fluorescense
A means of producing light from gaseous discharge.
High-Pressure-
A type of High-Intensity-Discharge lamp (HID). Sodium

Microphone
Sound system input device that reacts to and converts variable sound pressure into variable electrical current.
 Cross Light
Light originating from sources not facing each other, as from windows in adjacent walls.

Luminaire
A lighting unit consisting of one or more electrical lamps.

Eggcrate
A louvered construction divided into cell-like areas and used for redirecting the light emitted by an overhead source.

Floodlight
A lamp designed to project and diffuse a uniform level of illumination over a large area.

Passive Infrared
A type of perimeter detector which detects object in heat range of body temperature.

Passive Infrared
A type of perimeter detector which detects interruption of light beam.

Ultrasonic
A type of perimeter detector which detects change in sound wave pattern.

Microwave
A type of perimeter detector which is subject to falsealarm from aircraft radar and from movement outside buildingthrough
window, wood doors, and the like. It uses radio waves.
Passive Infrared
with Ultrasonic
(or Microwave)
This type of perimeter detector uses both the Passive infrared and Ultrasonic or Microwave system.

Proximity /
Capacitance
This type of perimeter detector detects a change in capacitance of the area covered, caused by intrusion.

Metal Halide
A high intensity discharge lamp in which the light is produced by the radiation from a mixture of a metallic vapor, similar to that Lamp
of a mercury lamp in construction.

Mercury Lamp
A type of lamp popular for lighting commercial interiors, uses argon gas to ease starting, it produces light by means of an
electric discharge in mercury vapor.

Tungsten Halogen
A type of lamp which produces light by means of the reaction of halogen additive in the bulb reacts with chemically with Lamp
tungsten.
High-Pressure-
Sodium (HPS)
A type of lamp generally used for roadways and sidewalks, uses sodium gas.

Frequency
The number of cycles per unit time of a wave or oscillations expressed in hertz of cycles per second.

Transmission
Loss
Of a partition, the number of decibels by which sound is reduced in transmission through it; a measure of the sound insulation
value of the partition, the higher the number, the greater the insulation value.

Infra Red
The other type of flame detector other than the ultraviolet type.
Porous
What type of sound absorbent is best for lower band frequencies. Absorbents

Refraction
The bending of sound wave when traveling forward changes direction as it passes through different densities.

1 lumen per sq.m.

Magnetic flux
Tesla is the unit of____.
Varies inversely
In Inverse Square Law, it states that: “sound intensity ______ the square of the distance from the source.” with
 a. Transmission
of sound
b. Effect of sound
waves
c. Generation of
Acoustics is a science that concerns with ______. sound

Curve surface
Creep is the phenomenon whereby sound travels in a ______.

a. Intensity of
sound from source
b. Material density
c. Medium

Sound Transmission Loss (STL) is/are affected by the following ____.

a. Shape and
proportion of room
b. Room cavity c.
Seating and other
furnishings
Which of the following factors affect/s room acoustics?

Nadir
A condition characterized as vertically downward directly below the luminaire. What is that term?

Sound absorption
It is the product of surface area (sq.ft.) and sound absorptioncoefficient (SAC). It has the unit sabin.
Architectural
Wallace Clement Sabine, an American physicist who pioneered work on sound is said to be the father of ____? acoustics

Structureborne
When sound impinges on a surface such as walls, floor, ceiling, etc. It is referred to as _____. sound

Environmental
A branch of acoustics that involves the control of noise pollution, environmental noise, which include motor vehicles, aircraft acoustics
noise, etc.

Hermholtz
resonator
This material is so named in honor of a German physicist, consista of a holllow material with a small hole on one side. This is
used to detect individual frequency of complex acoustic wave configuration.
Individual
A type of resonator made from empty clay vessels of different sizes. Their absorption ranges from 100-400 hertz. resonator

Threshold of
The rustling of leaves in breeze is said to be within the ____. hearing

Farad
Unit of capacitance is _____.

That sound
travels in a
vacuum

The following statements are true with regards to sound except ___. a. That sound is an aural sensation b. That sound is
caused by oscillation in an elastic medium c. That sound travels in a vacuum d. That sound is caused by the vibration of
particles which move in an infinitesimal amount causing particles to impart motion and energy to them ___.

a. Temperature
b. Kind of medium
c. Material density

The velocity of sound is affected by _____.

10% opening
Transondent facings are those transparent facings with holes. Which facing will reflect more sound?
 Cafeteria with
Which of the following sources of sound produces the highest sound pressure level (SPL)? people in it

Unit of frequency equal to one cycle per seconds HERTZ

Unit of loudness of level PHON

Prolongation of sound as a result of succesive reflection REVERBERATION

Distance sounds travels during each cycles of vibration WAVELENGTH

SOUND
Acoustical phenomenon which causes sound wave to bend or scattered around
DIFFRACTION

Fluctuation in pressure, a particle displaceent in elastic medium SOUND

Sound sensation in a single frequency PURE TONE

A luminous intensity of light expressed in candela; Unit of luminous intensity CANDELA

A lighting fixture LUMINAIRE

Unit of luminance equal to 1 candela per square meter LAMBERT

Unit of illmination equal to one lumen per square meter LUX

Unit of illumination equal to one square foot FOOT CANDLE

Rate of flow of light through a surface LUMINOUS FLUX

Resistance in AC system IMPEDANCE

Reciprocal of resistance CONDUCTANCE

SOUND
Rate of flow of sound energy
INTENSITY

ACCENT
Lighting used primarily to draw attention to particular point of interests
LIGHTING

A type of HID lamp HPS LAMP

Higher than 20,000 Hertz ULTRASONIC

Unit of acoustic absorption equivalent ot absorption by one square root of a perfect absorber SABINS

AVOIDING ZONES
First defense method from external noise by site selection and site planning for quiet internal acoustic environment OF DIRECT
SOUND

INSTALL
ABSORBENT
MATERIALS
The effective method can be employed to reduce direct noise, which is transmitted airborne, for noise reduction within a space
WITHIN THE
WALL OF THE
ENCLOSURE

Sound with a wavelength of 1.50 m at Frequency 1,500 Hz 7,380 fps

Perceptual characteristic of sound which is the average rate of flow of energy per unit area perpendicular to the direction of
INTENSITY
propagation
The physical behavior of sound when travelling forward in a straight path changes in direction as it passes through different
REFRACTION
densities and causes the sound waves to bend

Unit of loudness level. Phon

The process of dissipating sound energy by converting it to heat. Sound Absorption

Distance sound travels during each cycle of vibration. Wavelength

Sound
The reduction in the intensity or in the sound pressure level of sound which is transmitted from one point to another.
Attenuation

Unit of sound absorption equivalent to 1 square foot of perfectly absorptive material. Sabin

Acoustical phenomenon which causes sound wave to be bent or scattered around. Sound Diffraction

Threshold of
Minimum sound pressure level that is capable of being detected by the human ear.
Audibility

Fluctuation in pressure, a particle displacement in an elastic medium. Sound

Sound sensation in a single frequency. Pure Tone

Wave produced by a pure tone. Sine Wave

Synonymous with a lighting fixture. Luminaire

The luminous intensity of light is expressed in ___. Candela

Type of lighting dealing with relatively large area lighting. General Lighting

The rate of flow of light through a surface. Luminous Flux

The luminous intensity of any surface in a given direction per unit of projected area. Luminance

A unit of illumination equivalent to 1 lumen per square foot. Foot-Candle

A unit of illumination equivalent to 1 lumen per square meter. Lux

Type of lighting system where 90-100% of light output is directed to the ceiling and upper walls of the room. Indirect Lighting

The material used for filament in an incandescent bulb. Tungsten

The rate of flow of sound energy Sound Intensity

Lighting used primarily to draw attention to particular points of interest. Accent Lighting

A means of producing light from gaseous discharge. Fluorescense

High-Pressure-
A type of High-Intensity-Discharge lamp (HID).
Sodium (HPS)

Light originating from sources not facing each other, as from windows in adjacent walls. Cross Light

A lighting unit consisting of one or more electrical lamps. Luminaire

A louvered construction divided into cell-like areas and used for redirecting the light emitted by an overhead source. Eggcrate

A lamp designed to project and diffuse a uniform level of illumination over a large area. Floodlight

Porous
What type of sound absorbent is best for lower band frequencies.
Absorbents

The bending of sound wave when traveling forward changes direction as it passes through different densities. Refraction

The number of cycles per unit time of a wave or oscillations expressed in hertz of cycles per second. Frequency

Of a partition, the number of decibels by which sound is reduced in transmission through it; a measure of the sound insulation Transmission
value of the partition, the higher the number, the greater the insulation value. Loss