Acoustics and Sound Behavior

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What determines the overall effect on loudness in a room?

The shape of the room

Reflection of sound waves

Absorption present within the room (correct)

The type of music being played

What is the term for the prolongation of sound in a room?

Reverberation (correct)

Absorption

Echo

Resonance

What is the maximum reverberation time for clear speech?

3 seconds

4 seconds

2 seconds (correct)

1 second

What type of music is best suited to a reverberation time of 1-1.5 seconds?

Chamber music Signup and view all the answers

What happens to an echo in a highly reverberant room?

It gets lost in the general reverberation Signup and view all the answers

What is the ideal reverberation time for classrooms or lecture spaces?

Below 1 second Signup and view all the answers

What is the primary factor that determines the loudness of direct sound waves to a listener?

The loudness of the original source Signup and view all the answers

What happens to the direction of travel of a sound wave when it strikes a surface?

It changes direction Signup and view all the answers

What is the speed of sound waves?

768 miles per hour Signup and view all the answers

What are the two effects of multiple reflections of sound waves on acoustics?

Increased loudness and reverberation Signup and view all the answers

Why is the loudness of reflected sound always less than direct sound?

Reflected sound travels further and loudness diminishes with distance Signup and view all the answers

What determines the loudness of reflected sound?

Distance from the source and room absorption Signup and view all the answers

What is the minimum interval required to easily distinguish an echo in a room with low reverberation time?

1/2 second Signup and view all the answers

What type of surfaces produce very annoying echoes due to their focusing action?

Concave surfaces Signup and view all the answers

What percentage of sound is absorbed by hard, reflective, nonporous interior building surfaces?

2% to 5% Signup and view all the answers

What is the unit of sound absorption equivalent to one square foot having a coefficient of absorption of 1.00?

Sabin Signup and view all the answers

What is the frequency at which the absorption coefficient of a concrete floor is measured in the example?

500 Hz Signup and view all the answers

How many sabins would a 10,000 square feet concrete floor with an absorption coefficient of 0.015 at 500 Hz yield?

150 sabins Signup and view all the answers