Acoustics

Speed: The sound travels in waves. The speed of the wave changes according with the type of sound that you want to transmit. The speed is the distance traveled in the unit time.

Frecuency: number or complete Waves (cycles) in One second. It's measured in Hertz (Hz). F=cycles/time.

Wavelength: distance between the end of a wave with the beggining of another (m). If the frecuency of a wave is high the wavelength is short and if the frecuency is low the wavelength is long.

Longitudinal waves vibrate parallel to the direction of the travel of the wave.

Transverse waves vibrate at rigth angle to the direction of travel of the wave.

The sound is created by vibrating objects.

If you make a sound with your his lips you can see them move but you when you do a slow motion you can see the lips vibrating.

Large objects generate large waves and low frequency and vice versa, small objects generate small waves and created high frequencies.