Acoustics


 * Speed **

The speed of sound is the distance traveled during a unit of time by a sound wave propagating through an elastic medium. In kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity.

** Frequency **

Is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency.

** Wavelength **

In physics, the wavelength of a sinusoidal wave is the spatial period of the wave – the distance over which the wave's shape repeats. It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns.

** Longitudinal **

A wave with oscillations or vibrations along or parallel to their direction of travel.

** Transverse **

A wave that causes a disturbance in the medium perpendicular to the direction it advances


 * Sources of Sound - High speed film**

If it moves, it will sounds.

The sound is produce by the vibration of things; the musical instruments make music by the vibration of they parts, the guitar string or the battery plate work at this way.


 * Impulsive sounds**

A sound that lasts for a short period of time and includes frequencies over a large portion of the acoustic spectrum, such as a hammer blow or hand clap.
 * Whips and sonic booms**

Is the sound associated with the shock waves created by the supersonic flight of an aircraft. Sonic booms generate enormous amounts of sound energy, sounding much like an explosion. The crack of a supersonic bullet passing overhead is an example of a sonic boom in miniature.

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