when a sound waves strikes an acoustical material, it causes the particles of the material to vibrate. this vibration will produce heat due to the friction created by the vibrating particles. hence, energy from sound is converted to heat. A desirable property of an acoustic material is sound.

• isolation

• reflection

• transmission

• absorption

a buzzling/clicking sound comprised of repeated echoes traversing back and forth between two reflective surfaces

• creep

• baffling

• flutter

• standing wave

transmission coefficient is 0.001, what is the sound pressure level?

• 50db

• 40db

• 30db

• 20db

more than 20,000 hertz is called?

• ultrasonic

• ultrasound wave

• high frequency

• low density

for a conference room, which will you apply for the best sound diffusion?

• flat

• inclined

• concave

• convex

shape of a room where there are two focus points. the sound projected from one focus point, in any direction, will travel to the other focus point.

• circle

• ellipse

• parabola

• rectangle

shape of a room with one focus point

• circle

• ellipse

• parabola

• square

which among the choices given is the best way to prevent sound transition?

• cavity wall

• double wall

• drywall with insulation

• gypsum board

which will you use for a library?

• diffuser

• foam and egg crate

• egg crate

• mineral wool

which is best for concert hall?

• diffuser

• egg crate

• foam and egg crate

• mineral wool