# Differences

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 phy131studiof17:lectures:chapter15 [2017/11/01 22:37]mdawber [Refraction and Diffraction] phy131studiof17:lectures:chapter15 [2017/11/03 11:32] (current)mdawber Both sides previous revision Previous revision 2017/11/03 11:32 mdawber 2017/11/01 22:37 mdawber [Refraction and Diffraction] 2017/08/04 13:41 external edit 2017/11/03 11:32 mdawber 2017/11/01 22:37 mdawber [Refraction and Diffraction] 2017/08/04 13:41 external edit Line 244: Line 244: Recall that for waves on a string $v=\sqrt{\frac{F_{T}}{\mu}}$ so if you take a string and stretch it further you need to take in to account both changes in $l$ and $v$. Recall that for waves on a string $v=\sqrt{\frac{F_{T}}{\mu}}$ so if you take a string and stretch it further you need to take in to account both changes in $l$ and $v$. - ===== Making Sound - String Instruments ===== - The note in [[http://​www.phys.unsw.edu.au/​jw/​strings.html|string instruments]] is generated by exciting a vibration and promoting a particular vibration in the string. - - String instruments also use the body of the instrument to amplify the sound. We can see the standing wave patterns of objects with [[http://​www.animations.physics.unsw.edu.au/​jw/​SHM.htm#​chladni|Chladni Patterns]]. Some examples on a [[http://​www.phys.unsw.edu.au/​jw/​patterns3.html|violin]] and a [[http://​www.phys.unsw.edu.au/​music/​guitar/​patterns.html|guitar]]. And now with [[http://​www.bbc.co.uk/​news/​science-environment-13573631|lasers]]. - - For a great page on music acoustics: ​ [[http://​www.phys.unsw.edu.au/​music/​]] - - ===== Open and closed pipes ===== - - {{organpipes.png}}