Room Acoustics Basics
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Questions and Answers

What is the main factor that influences the loudness of reflected sound in a room?

Room absorption

What term is used to describe the prolongation of sound caused by waves ricocheting between room surfaces?

Reverberation

How is reverberation time defined?

The time measured in seconds a sound average loudness can be heard before it becomes inaudible under quiet conditions.

At what point does speech become unintelligible due to excessive reverberation time?

<p>4-10 seconds</p> Signup and view all the answers

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

<p>Below 1 second</p> Signup and view all the answers

What is the recommended reverberation time for orchestral, choral, and church music?

<p>1.5-2 seconds</p> Signup and view all the answers

How does the reflection of sound waves affect acoustics?

<p>It increases loudness and causes reverberation.</p> Signup and view all the answers

What determines the loudness of direct sound waves to a listener?

<p>The loudness of the original source and the listener distance from the source.</p> Signup and view all the answers

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

<p>Because reflected sound travels further and loses energy by absorption at each reflection.</p> Signup and view all the answers

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

<p>Increased loudness and reverberation.</p> Signup and view all the answers

What is the result of combining direct sound and reflected sound in terms of loudness?

<p>The combined loudness is greater than direct sound alone.</p> Signup and view all the answers

How does the direction of travel of a sound wave change when it strikes a surface?

<p>The direction changes due to reflection.</p> Signup and view all the answers

What is the interval needed for an echo to be easily distinguished in a room with low reverberation time?

<p>greater than 1/2 second</p> Signup and view all the answers

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

<p>concave surfaces</p> Signup and view all the answers

What percentage of sounds do hard, reflective, nonporous interior building surfaces absorb?

<p>2% to 5%</p> Signup and view all the answers

What is a perfect sound absorber?

<p>an open window</p> Signup and view all the answers

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

<p>sabin</p> Signup and view all the answers

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

<p>150 sabins</p> Signup and view all the answers

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