Music and Sound


soundwaves

Picture from:
http://www.feature.fm/blog/what-is-music-2/






Picture from:
http://www.posterus.sk/?p=13941
Sound travels through many different mediums--even the human body. Hence, people can "feel the beat" at a rock concert or when music is really loud because the sound creates a pressure difference in their bodies as the sound travels through them. Low notes have a wider wave so people can actually feel them vibrating their bodies. High notes are thinner waves so people can't seem to detect the pressure difference vibrating their bodies as well.  

Different instruments sound different even if they are all the same pitch because the quality of the sound or timbre is different. Stringed instruments create music through the plucking, rubbing, or striking of the strings. Each string has a certain frequency that it naturally vibrates at. The vibration of the strings cause the air to vibrate at the same frequency and, thus, music is produced (if the person playing the instrument actually knows how to play well). Short strings cause sound waves that are higher pitched and long strings cause sounds that are lower pitched. Thinner strings also have a higher pitch than thicker strings.

Wind instruments work by controlling the amount of air that vibrates.
Image result for how stringed instruments work

Picture from:
http://www.co-bw.com/Audio_Acoustic_Instruments.htm
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