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Acoustics: Sound Absorption Quiz

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Questions and Answers

What does the sound absorption coefficient α represent?

Sound absorption properties affecting sound absorbers

Total room absorption in Sabins

Fraction of incident sound energy that a material absorbs (correct)

Intensity absorbed by the material

Which value of α indicates perfect absorption with all incident sound energy absorbed?

α = 10

α = 0

α = 1 (correct)

α = 0.20

In the context of sound absorption, what does the term 'Sabins' refer to?

Density of sound-absorbing materials

Measurement unit of total room absorption (correct)

Intensity level of sound waves

Surface area in ft^2

What type of materials are referred to as sound-reflecting based on their absorption coefficient?

Materials with α < 0.20 Signup and view all the answers

Which property affects sound absorbers related to 'thickness'?

Thickness Signup and view all the answers

What does the formula NR = 10 Log a2/a1 represent in the context of sound absorption?

Noise reduction due to sound absorption Signup and view all the answers

In a room with no acoustical treatment, where does a person hear reflected sound from?

Ceiling Signup and view all the answers

What is the main difference in what a person hears in a room with acoustical treatment compared to a room with no treatment?

Less reflected sound from the ceiling Signup and view all the answers

What is the Free-Field condition in acoustics?

When sound waves are free from the influence of reflective surfaces Signup and view all the answers

What defines the effectiveness of a sound-absorbing material in acoustics?

Absorption Coefficient (α) Signup and view all the answers

Why does more absorption in a room lead to less build-up of sound energy in the reverberant field?

Absorbed sound waves do not contribute to reflections Signup and view all the answers