L10 M2

Question 1

What are the fundamentals of acoustics?

Answer 1

Wavelength, amplitude, frequency

Question 2

Finishes absorb OR reflect sound:
Porous, soft materials tend to ____
Dense, hard materials ____

Answer 2

Absorb, reflect

Question 3

How does fibrous energy change sound energy into heat energy?

Answer 3

frictional drag

Question 4

Noise criteria (NC):
Theatre = \_\_\_
Conference room = \_\_\_
Private office = \_\_\_
Open office / retail = \_\_\_

Answer 4

10-20
25-30
30-35
35-50

Question 5

Cement-gypsum self-levelling floor covering reduces sound trans. thru floor and seals floor-to-wall
true/false

Answer 5

true

Question 6

What material is placed on the sub floor to absorb the noise?

Answer 6

resilient quilt

Question 7

Two types of walls that reduce sound transmission through walls?

Answer 7

staggered stud wall

double wall

Question 8

____ mounting helps control sound transmission through walls.

Answer 8

resilient

Question 9

What is flanking?

Answer 9

when the noise finds a path around an isolated surface

Question 10

High frequency sounds (treble) are harder to stop than low frequency sounds (bass). true/false

Answer 10

false

Question 11

NZ building code requires a minimum STC ___, ITC ___

Answer 11

55, 55

Question 12

The ideal combination of material types for creating quality of listening conditions are:

Answer 12

absorber over reflector

Question 13

In acoustics, _______________ is the number of pressure difference cycles that occur within one second.

Answer 13

frequency

Question 14

One solution to reducing the transmission of sound through a floor is to “float the floor”, which entails specifying a soft, resilient floor finish such as plush carpeting. true/false

Answer 14

false