Acoustics

Speed
The **speed of sound** is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20 °C (68 °F), the speed of sound is 343.2 metres per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph), or about one kilometer in three seconds or approximately one mile in five seconds. In fluid dynamics, the speed of sound in a fluid medium (gas or liquid) is used as a relative measure of speed itself. The speed (in distance per time) divided by the speed of sound in the fluid is called the Mach number. Objects moving at speeds greater than //Mach1// are traveling at supersonic speeds.  The phase velocity of a sound wave. Also known as sonic speed; sonic velocity; sound velocity; velocity of sound.

Frequency
A frequency (abbreviation: **AF**) or **audible frequency** is characterized as a periodic vibration whose frequency is audible to the average human. It is the property of sound that most determines pitch and is measured in hertz (Hz). The generally accepted standard range of audible frequencies is 20 to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors. Frequencies below 20 Hz are generally felt rather than heard, assuming the amplitude of the vibration is great enough. Frequencies above 20,000 Hz can sometimes be sensed by young people. High frequencies are the first to be affected by hearing loss due to age and/or prolonged exposure to very loud noises. ===

Wevelength
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.Wavelength is commonly designated by the Greek letter //lambda// (λ). The concept can also be applied to periodic waves of non-sinusoidal shape.The term //wavelength// is also sometimes applied to modulated waves, and to the sinusoidal envelopes of modulated waves or waves formed by interference of several sinusoids.The SI unit of wavelength is the meter.

Longitudinal
A wave that is propagated in the same direction as the displacement of the transmitting medium Compare longitudinal wave. A wave that oscillates back and forth on an axis that is the same as the axis along which the wave propagates. Sound waves are longitudinal waves, since the air molecules are displaced forward and backward on the same axis along which the sound travels. Compare transverse wave. See more at wave.

Transverse
A wave, such as an electromagnetic wave, that is propagated in a direction perpendicular to the direction of displacement of the transmitting field or medium Compare longitudinal wave. A wave that oscillates perpendicular to the axis along which the wave travels. Electromagnetic waves are transverse waves, since the electric and magnetic fields oscillate at a right angle to the direction of motion. Waves in bodies of water are also transverse waves, since the molecules of water oscillate up and down perpendicular to the direction of the wave's motion. Compare longitudinal wave. See more at wave.

We are also examples with different musical instruments and the same generate waves that are different and vary in their lenth, amplitude and frequency but different despite the union of all these sound waves create a wave harmonically reaching the human being so nice and Unison
 * In the first video be seen as occurs the sound and as sound waves travel and reach the human that despite not being visible to the eye in the video with some graphics show us how to create and how to travel to reach and convey the message, change is also seen as waves generated various movements and forms that rely on sound.
 * In the video number two we explain how sound is created by the example of the band music and how sound waves are different from one another depending on the vibrations that are generated in this case the band is playing.


 * A solution for unwanted noise or to improve communication is the use of panels that help the comfort of the rooms that are too large or have very high ceilings where communication is difficult and sound frequencies, these panels should be placed with a proper separation of the walls to work and create spaces that are appropriate and ensure the performance of the people who inhabit this place.

The first is a room with little sound absorption, a " hard room" in w hich the surface REFLECT MOST of the noise.
 * Another reading it relates to how to design spaces depending on the activities to be performed on the same as each space must have different conditions generated by the activities of this place, this implies that when we design spaces consider each of these aspects of sound that affect the welfare of our customers.


 * Different types of room will create such different sound fields that this in itself requires different descriptors if a meaningful evaluation is to be made. The list of actual types of rooms can of course be made very long but, if we restrict ourselves to the most common ones, three different basic acoustic types can be identified.


 * When a sound wave strikes one of the surfaces of a room, some of the sound energy is reflected back into the room and some penetrates the surface. Parts of the sound wave energy are absorbed by conversion to heat energy in the material, while the rest is transmitted through. The level of energy converted to heat energy depends on the sound absorbing properties of the material.
 * There are two ways to optimize the acoustics in the rooms one with vertical panels and a sound insulated both what they do is improve the quality of acoustics within the space and the comfort in the rooms where these mechanisms are installed