Acoustics

= Acoustics = = = Is the rate of motion, or equivalently the rate of change of distance. In other words, the distance travelled in unit time. Is the number of waves that pass a point per second. This is measured in hertz Is the distance between watching points on a wave. This is sometimes called Lambda and it’s measured in meters Longitudinal waves vibrate parallel to the direction of travel of the wave. Sound waves are longitudinal. Transverse waves vibrate at right angles to the direction of travel of the wave. Light and radio waves are transverse. __ Sound Sources: video notes __ Sound is normally caused by objects vibrating. Large objects that create large wavelength creates sound of low pitch or low frequency. Small objects create small wavelength and low pitch. The travel of sound waves is similar as inflating a balloon. As the balloon expands it becomes more transparent, that is because the rubber expands. With waves occur the same, as they expand they loose energy. acceleration noise occurs when air is blown in a low compression mode. An example of this is clapping your hands. The resonance is what remains after the acceleration noise. when something at high pressure explodes forms a wave called the shock wave.
 * Speed **
 * Frequency **
 * Wavelength **
 * Longitudinal **
 * Transverse **