BU3 Preliminary Examinations

Tones made by complex objects such as exhaust fans

A hard material used in between two soft materials to prevent passage of sound while retaining absorption

Sounds in the audible spectrum that are more than 180 decibels

Father of Architectural Acoustics

Sabine created solutions for the acoustics of this structure

Hard surface engraved with reliefs that reflect and thus, amplify the sound

An auditory sensation in the ear; disturbance in a medium (solid, liquid, gas) that can cause auditory sensation

Odd One Out : Which of the following is not a sound phenomenon?

Rubber based underlayment made from recycled rubber tires

The angle at which sound hits a surface

anechoic wedge-shaped design ideal for extremely low sound and high frequency sound

Acoustic material that may be used in walls and ceilings and covered with gypsum plaster

T or F : For musical performances, it’s better to make sound last as long as possible

Bending of waves of the travel of sound caused by an obstacle in its path

Hearing damage that causes constant ringing in the ears

When pressure oscillations are generated in an elastic medium at rates detectable by a hearing medium

prolongation of sound

The height of a wave; the maximum deviation of wave from its average value

Flexible reinforced foil-faced loaded vinyl noise barrier typically used to wrap noisy pipes and ducts

Low frequency sound

12”x12” square polyurethane foam panels ideal for extreme noise sources, bass noise, impact noise, or anechoic chambers

Longitudinal pressure wave in air especially one producing an audible sensation

Acoustic insulation for gaps created by doors made of rubber, gasket, or sealant

The SI unit of frequency, equal to one cycle per second (Hz)

T or F : Reflected energy have equal angles of reflection and incidence

Sounds in the audible spectrum that are less than 0 decibels

Change in direction which sound waves undergo when entering a different medium

Created a sound generator for them to be able to capture the very first photo of sound

The distance measured in the direction of a wave from any one point to the next point of a corresponding cycle

Reflection happens in surfaces that are _________ and ________

The order of the layers used in a duct (Interior ro Exterior)

When a sound wave encounters a sharp discontinuity in the density of its medium, some energy is reflected

The sensation stimulated in organs of hearing by mechanical radiant energy transmitted as longitudinal pressure waves

The time it takes for the sound level to drop 60 decibels for varying amounts of absorptive materials

Wave motion in air or other elastic media

Designed the acoustics of the Paris Opera House

The #1 inhibitor of productivity

The angle at which sound is reflected from a surface

Rate of reflection and absorption of materials

The number of cycles per unit of a wave (per second: e.g. 20Hz = 20 cycles per second)

Acoustic materials used for spaces with heavy and loud equipment such as generator set rooms

The reflection of sound off a convex or uneven surface

Triangular traps used in corners of ceilings commonly used with melamine wedges and absorbs bass sounds

T or F : The thicker the insulation, the more likely it is to absorb Bass sounds

Sounds that are faster than ultrasound (above 1 gigaHertz)

Tones created by Tuning Forks

Chambers that are so silent, its users could hear their own bodies’ sounds

T or F : Acoustics is generally a linear phenomenon

Tones made by instruments

One of the leading disabilities in the world

High frequency sound

Unsafe levels of sound

Middle frequency sound

Summation of surface area of materials and NRC multiplied to the sound absorption coefficient

A branch of physics that deals with the production, control, transmission, reception, and effects of sound