Sound



Sound is a form of Mechanical wave, as it needs a medium such as liquids, air or solids to travel it also means it cannot travel through the vacuum of space. It can travel at 330m/s



__http://www.physicsclassroom.com/class/sound/u11l1a.cfm&docid=Al9FfCwMqRLDPM&w=219&h=102&ei=DaxVTsqNGYTzmAXDsLUK&zoom=1&iact=hc&vpx=527&vpy=241&dur=5870&hovh=81&hovw=175&tx=50&ty=41&page=1&tbnh=76&tbnw=163&start=0&ndsp=21&ved=1t:429,r:7,s:0__ - The speed of sound depends on what Medium it is traveling in and what the temperature is. Sound travels fastest in solids due to the particles being closer together or denser which means it can pass from particle to particle with ease. Air is the slowest way in which sound can travel as the particles are not connected together and do not bump together as much. Liquids are in the middle because the particles are spread out but still have stronger bonds then air which means the bump together more frequently then air but not as much as solids. It also depends on the temperature because the hotter it is the faster the particles move and the more frequently they bump which therefore makes sound pass through the particles faster.

- Sound waves travel in a longitudinal form which means that it travels through particles compressing and refracting

- Pitch is a word to describe the frequency of sound, if a sound is a high frequency it is also known to be at a high pitch, this principal also applies for low frequencies

- The Doppler effect is when a sound wave moves which causes someone to hear different frequencies. For example a fire truck siren, as it moves close the frequency of waves increase thereby increasing pitch while when it moves away frequency decreases causing the sound wave to be lower in pitch.

- Echoes are cause when sound bounces off a substance or surface and returns to the listener. An example of this is the way a submarine uses sonar, a sound wave is sent out which bounces off a surface and returns to the submarine which is shown on a radar.

- Resonance: There is two contexts that Resonance can put into, in physics it occurs when an object oscillates to create maximum amplitude possible at a certain frequency. In music it occurs when sound particles vibrate together in either an enclosed environment or open air. media type="youtube" key="8i6hTU0jw-g" height="345" width="420"