Exam 8: Acoustical Properties of Materials

What is the approximate range of frequencies (h)in human speech and their corresponding wavelengths? For all practical purposes, the speed of sound in air may be assumed = 1,000 ft/s in place of its exact value of 1130 ft/s.

For a party wall between two dwelling units, such as two apartments, the building codes require its minimum STC value to be

The addition of a resilient floor covering, such as vinyl tiles, improves the structures- borne sound insulation of a wood joist floor. Will the vinyl tiles also improve the airborne sound insulation of a floor?

Compared to a lightweight building element, a heavyweight element is generally a poor transmitter of airborne sound.

The wavelength of sound at a frequency of 1,000 Hz is approximately

Explain what transmission loss (TL)is. What is its unit of measurement?

Cycles per second is also called a

What is the minimum building code- required STC value for a party wall separating two dwelling units (condominiums or apartments)?

A commonly used porous sound absorber is

A sound barrier with an STC of 50 will generally

The International Building Code requires minimum STC 50 for a party wall between two dwelling units (condominiums or apartments). In terms of the transmission of speech or music through the wall, what will STC 50 provide?

What is impact insulation class, IIC? What is its unit of measurement?

What does the frequency of sound measure? What is the unit of measurement of frequency?

Sound speed in air is approximately

Which wall assembly will provide a higher sound transmission loss (TL): (a)a 6- 1/2- in.- thick stud wall comprising 1- 1/2 in. × 5- 1/2 in. wood studs covered on each side with 1/2- in.- thick gypsum board or (b)same as wall type (a)but the air space between studs is filled with fiberglass? Give reason(s)for your answer.

What is the speed of sound in air?

The measure that is used for structure- borne sound insulation is

Which wall assembly will provide a higher sound transmission loss (TL): (a)6- 1/2- in.- thick concrete wall or (b)a 6- 1/2- in.- thick stud wall comprising 1- 1/2 in. × 5- 1/2 in. wood studs covered on each side with 1/2- in.- thick gypsum board? Give reason(s)for your answer.

The wavelength of sound at a frequency of 100 Hz is approximately

The pitch of a sound is related to