18 Questions
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?
4-10 seconds
What is the ideal reverberation time for classrooms or lecture spaces?
Below 1 second
What is the recommended reverberation time for orchestral, choral, and church music?
1.5-2 seconds
How does the reflection of sound waves affect acoustics?
It increases loudness and causes reverberation.
What determines the loudness of direct sound waves to a listener?
The loudness of the original source and the listener distance from the source.
Why is the loudness of reflected sound always less than direct sound?
Because reflected sound travels further and loses energy by absorption at each reflection.
What are the two effects of multiple reflections of sound waves on acoustics?
Increased loudness and reverberation.
What is the result of combining direct sound and reflected sound in terms of loudness?
The combined loudness is greater than direct sound alone.
How does the direction of travel of a sound wave change when it strikes a surface?
The direction changes due to reflection.
What is the interval needed for an echo to be easily distinguished in a room with low reverberation time?
greater than 1/2 second
Which type of surfaces can produce very annoying echoes due to their focusing action?
concave surfaces
What percentage of sounds do hard, reflective, nonporous interior building surfaces absorb?
2% to 5%
What is a perfect sound absorber?
an open window
What unit of sound absorption is equivalent to one square foot having a coefficient of absorption of 1.00?
sabin
How many sabins will a concrete floor of 10,000 square feet, with an absorption coefficient of 0.015 at 500 Hz, yield?
150 sabins
Learn about how sounds behave in enclosed spaces and the principles of acoustics including the loudness of direct sound waves and reflected sound. Evaluate the amount of acoustical material required for different spaces.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
