Acoustics

Question 1

Sound power

Answer 1

The rate at which sound energy is produced at a source

Question 2

Sound intensity

Answer 2

The power distributed over a unit area

Question 3

Sound pressure

Answer 3

Average variation of atmospheric pressure caused by the sound

Question 4

Decibel

Answer 4

Logarithmic scale for intensity of sound or power level to compare with

Question 5

Reverberation

Answer 5

The continuation and enhancement of a sound caused by rapid multiple reflections between the surfaces of a room

Question 6

Reverberation time

Answer 6

The time taken for a sound, when stopped, to decay by 60 dB

Question 7

Flutter echoes

Answer 7

Sound traveling quickly between two parallel reflective surfaces

Question 8

Room modes

Answer 8

The collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker

Question 9

3 type of modes in a room

Answer 9

Axial
Tangential
Oblique

Question 10

Perceived Articulation Index

Answer 10

To assess speech intelligibility from different areas of the room and to be noted what is heard. Number of words understood out of the total is expressed as a percentage

Question 11

Golden ratio

Answer 11

For ideal acoustics.
Minimises acoustic resonance, standing waves and room modes
1.618…