A type of noise that is produced by combining sounds of all different frequencies together.
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Correct Answer:
White noise
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He is considered as the father of architectural acoustics.
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Wallace Clement Sabine
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The scientific study of sound perception and audiology – how humans perceive various sounds. More specifically, it is the branch of science studying the psychological and physiological responses associated with sound (including noise, speech and music).
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Psychoacoustics
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A transducer that converts sound into an electrical signal.
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Microphones
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Perceived as how "loud" or "soft" a sound is and relates to the totaled number of auditory nerve stimulations over short cyclic time periods, most likely over the duration of theta wave cycles.
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Correct Answer:
Loudness
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The human ear has receptors that can detect sound frequencies ranging from 16 vibrations to _____ vibrations per second.
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Correct Answer:
20,000
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Ultrasonic waves are sound waves transmitted at a frequency greater than ____ hertz per second or beyond the normal hearing range of humans.
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Correct Answer:
20,000
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Refers to the deflection of sound waves around a small obstacle or part of an obstacle, or at the edge of a large obstacle or restricted opening.
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Correct Answer:
Diffraction
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A family of non-destructive testing techniques based on the propagation of ultrasonic waves in the object or material tested. It is used in many industries including steel and aluminium construction, metallurgy, manufacturing, aerospace, automotive and other transportation sectors.
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Ultrasonic testing
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A measure of the opposition that a system presents to the acoustic flow resulting from an acoustic pressure applied to the system.
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Acoustic impedance
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A measure of the energy loss of sound propagation media?
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Acoustic attenuation
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A low-density part of the wave. This is the trough of the wave.
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Refraction
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A high-density part of the wave. It is the peak of the wave
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Compression
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The time required for one complete cycle of a wave oscillation.
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Correct Answer:
Period
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A science that deals with the production, control, transmission, reception, and effects of sound
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Acoustics
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The process of adding background sound to reduce noise distractions, protect speech privacy and increase office comfort
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Sound masking
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A wave in which the particles of the medium vibrate back and forth in the ‘same direction’ in which the wave is moving. Medium can be solid, liquid or gases.
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Longitudinal Waves
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For buildings as noise shields; a long building, or a row of buildings parallel to a highway cannot shield other more distant structures or open areas from noise.
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Correct Answer:
False
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The combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience.
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Correct Answer:
Sound Reinforcement System
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Double-glazed windows are paired panes separated by an airspace or hung in a special frame. Which of the following techniques cannot increase the performance of the double-glazed window in reducing noise?
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Correct Answer:
Use of slightly similar thickness of the panes
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Sound waves are what type of wave?
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Correct Answer:
Longitudinal Waves
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The decrease in energy or pressure per unit area of a sound wave, occurring as the distance from the source increases as a result of absorption, scattering, or spreading in three dimensions.
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Attenuation
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The intensification and prolongation of sound produced by sympathetic vibration.
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Resonance
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What is the persistence of a sound within an enclosed space, caused by multiple reflections of the sound after its source has stopped.
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Correct Answer:
Reverberation
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In general, plantings by themselves do not provide much sound attenuation. It is more effective, therefore, to use plantings in conjunction with other noise reduction techniques and for aesthetic enhancement.
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Correct Answer:
True
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The repetition of the sound produced by the reflection of sound waves from an obstructing surface, loud enough and received late enough to be perceived as distinct from the source.
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Echo
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Which of the following wall types shows the highest sound insulation values?
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Correct Answer:
12” Brick wall
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The minimum sound pressure capable of stimulating an auditory sensation; usually 20 micropascal or zero db.
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Correct Answer:
Threshold of hearing
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The unit for expressing the relative pressure or intensity of sounds on a uniform scale from 0 for the least perceptible sound to about 130 for the average threshold of pain.
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Correct Answer:
Decibel
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The level of sound intensity is high enough to produce the sensation of pain in the human ear, usually around 130 db.
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Correct Answer:
Threshold of pain
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What is a vibration having a frequency that is an integral multiple of that of the fundamental.
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Correct Answer:
Harmonic
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The SI unit of frequency, equal to one cycle per second.
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Correct Answer:
Hertz
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The maximum deviation of a wave or alternating current from its average value.
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Amplitude
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An apparent shift in frequency occurs when an acoustic source and listener are in motion relative to each other, the frequency increasing when the source and listener approach each other and decreasing when they move apart.
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Correct Answer:
. Doppler Effect
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The rate at which acoustic energy flows through a medium, expressed in watts per square metre.
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Correct Answer:
Sound Intensity
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The velocity of sound travelling through air.
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Correct Answer:
Speed of sound
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Defined as the loss that occurs when a sound goes through a partition or barrier. A higher TL number means more loss, i.e., less acoustic energy gets through.
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Correct Answer:
Transmission loss
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The distance, measured in the direction of propagation of a wave, from any one point to the next point of corresponding phase.
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Correct Answer:
Wavelength
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A Lamp that produces light as a result of an electrical discharge, generated between two electrodes, in a high-pressure mercury vapour that is contained in a transparent bulb.
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Correct Answer:
High Pressure Mercury Lamp
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Lamps have a borosilicate glass gas discharge tube (arc tube) containing solid sodium, a small amount of neon, and argon gas in a Penning mixture to start the gas discharge.
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Correct Answer:
Metal Halide Lamp
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An electrical lamp that produces light by an electric arc through a gaseous mixture of vaporised mercury and metal halides.
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Correct Answer:
Metal Halide Lamp
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The glare of all luminaires that are in the room regularly can be evaluated with the UGR method, as specified in the standard EN 12464-1 “Lighting of indoor workplaces”. What is UGR?
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Correct Answer:
Unified glare rating
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HCL expresses the positive effect of light and lighting on the health, well-being and performance of humans and thus has both short and long-term benefits.
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Correct Answer:
Human Centric Lighting
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The amount of light or density of luminous flux striking a unit area.
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Correct Answer:
Illuminance
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A type of Light colour temperature which is best in bathrooms, kitchens and basements; good for reading, intricate projects, or applying makeup-provides the greatest contrast among colours.
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Correct Answer:
Daylight
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A type of Light colour temperature which is best in kitchens, bathrooms or garages; giving rooms a whiter, more energetic feel
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Correct Answer:
Bright While/ Cool White
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The number of cycles per unit time of a wave or oscillation.
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Correct Answer:
Frequency
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