Acoustics

__**Definitions**__
 * **Speed:** Distance travelled per unit time.
 * **Frequency:** The number of times a specified periodic phenomenon occurs within a specified interval.
 * **Wavelength:** The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest.
 * **Longitudinal:** Vibration parallel to direction of travel.
 * **Transverse:** Vibration at right angle to direction of travel.

Sound waves and their sources Three different sources of sound give voice to musical instruments: vibrating columns of air, vibrating surfaces and vibrating strings. Musical or not, every sound originates in a vibrating object. Three auditory afects of musical sounds: loudness pitch and quality.
 * __Videos__**

Reverberance: is linked to the speed at which sound energy disappears in a room. An unfurnished room with hard surfaces, such as a church, is perceived as being more reverberant than a well-furnished living room.
 * __Notes__**

Soundproofing (sound blocking): If the objective is to stop sound from entering or leaving a space, then you will most likely need sound blocking or soundproofing.

Sound absorption (acoustic enhancement): If the objective is to enhance the properties of sound by improving speech clarity and sound quality, then the answer is sound absorption or acoustic enhancement.