Acoustic+vocabulary+and+notes+(week+5)

Faster speed less distance Slower speed more distance Speed (v)= frequency (f) x wavelength Frequency = speed / wavelength Wavelength = speed / frequency **Sound transmission:** __Solid:__ in a solid the particles are close together. The vibration passes from one particle to the next easily. A sound wave therefore travels quickly through solids. __Gas:__ in a gas the particles are further apart. The vibration passes from one particle to the next less easily. A sound wave therefore travels slowly trough gas. __Note:__ Sound speeds up when it enters a denser material. Sound waves travel more slowly through cold air. At night sound is better than during the day. **Wave behavior:** Reflection: waves bounce off a surface. There are two laws of reflection: 1. The angle of incident is equal to the angle of reflection. 2. The incident ray or wave, the reflected ray or wave, and the normal all lie in the same plane. Refraction: waves bend when they pass through a boundary. When waves change speed they also chance direction. Diffraction: the waves spread out when they pass through a small gap Echoes: Distance travelled = speed x time taken Speed = distance travelled / time taken Time taken = distance travelled / speed Sonar: when boats use echoes to find out the depth of the sea.
 * Wave equation:**

**Acoustic Video tips: ** -Sound is normally caused by objects vibrations. Each vibration creates waves and frequency. -Small objects have shorter waves and high frequency notes. -The waves farther from start point have less sound. -When we clap our hands we compress air and make an acoustic wave. That’s why we found different sounds of claps. -The sound of a cymbal is different because come from vibrations. It is an acceleration noise. -When an object gets broken it makes different sounds because each piece has a different vibration. -Macuat is the name for speed of sound. -Whips have a special curve form and the rope gets thicker at the end of it, and that helps making a solid and fast sound.