It is the level of sound intensity high enough to cause pain and discomfort. Longer exposure to such sound can cause permanent damage to our hearing ability.

It is the phenomenon of persistence of sound after it has been stopped as a result of multiple reflections from surfaces such as furniture, people, air, etc. within a closed surface.

It is a classification of sound that pertains to the “low-frequency sound waves with frequency below the limit of audibility of human.

It is the term used to define the rapid succession of echoes caused by the reflection of sound waves back and forth between two parallel surface, with sufficient time in between to cause the listener to be aware of each reflected sounds’ separation

It is the rate of decrease of sound pressure level after the sound has stopped. It is measured in decibels (dB) per second.

Refers to frequencies above 20,000 Hz (20,000 cycles per second). It is basically the sound waves with frequencies higher than the audible limit of human hearing.

If a typical bat can hear frequencies from 9Hz up to 120,000Hz, what is the audible limit (aka hearing range) of a human being? Frequencies beyond this limit is basically cannot be heard by us.

It is the type of sound that are periodic and somewhat regular

It is the reflection of sound, arriving at the listener sometime after the direct sound.

The process by which a material, structure, or object takes in sound energy when sound waves are encountered. Part of the sound energy is transformed into heat, and part of it is transmitted through the body.

It describes how sound waves bend, or change direction, as they travel around the edges of obstacles.

It is the change in direction of waves that occurs when waves travel from one medium to another (one being a fast medium the other being slow)

Theperceptual property of sound that makes it possible to be judged as “higher” or lower”. Associated with musical melodies.

In music an interval whose higher note has a sound wave frequency of vibration twich of that of its lower note

It is the characteristic of sound that determines the sound’s relative loudness. This loudness, in turn, is determined by the intensity in sound waves. Usually measured in Decibels (dB)

Four (4) of these are the characteristic of sound. Pick which is/are not included

I. Amplitude

II. Frequency

III. Timbre

IV. Resonance

V. Duration

Typical refrigerator produces a humming sound that’s 50dB in intensity. What is the intensity of a normal conversation that is moderate to quiet.

Physical or mental weariness caused by prolonged exposure to loud noises

The detailed study of the use of a building, the location, and orientation of its spaces, possible sources of noise, and the desirable acoustical environment in each usable area.

The application of absorbent or reflecting materials to the walls, ceiling, and floor of an enclosed space to alter or improve its acoustic properties

It is the measure of the efficiency of a material in absorbing sound at a specified frequency, equal to the fractional part of the incident sound energy at that frequency absorbed by the material

It is the measure of the sound-absorbing efficiency of the material, equal to the average of the absorption coefficients of the material, computed to be nearest 0.05 at four frequencies: 250, 500, 1000, and 2000hz.

One of a series of curves representing the sound pressure level across the frequency spectrum for background noise that should be exceeded in various environments.

A curve representing the sound pressure level at which sounds of diferent frequencies are judged by a group of listeners to be equally loud.

One of a number of acoustic panels installed near the ceiling of a concert hall to reflect sound for improving the acoustic quality of the music