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Waves
Guitar String Waves and Musical Notes
Description
Guitar string waves depend on linear mass density, tension, and string length. Linear mass density means the mass per unit length of the string. When the density stays constant along the string, it equals the total mass divided by the total length. Changing this linear density can change the wave speed.
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Transcript
当拨动标准有效弦长的六弦吉他上的低音E弦时,会发出基频。如果已知该弦的线密度,那么低音E弦中的张力是多少?
基波波长是有效弦长的两倍。
波速等于基波波长乘以基频。
现在,弦的张力等于弦的线密度乘以波速的平方。
将波速表达式代入张力方程中。
将有效弦长、基频和线密度的数值代入公式,计算出低音 E 弦所需调音的张力。
请注意,频率与有效弦长成反比。
因此,通过在任意品丝上按压琴弦以缩短其有效弦长,便可演奏出高于设定频率的音高。
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