A guitar string is 90 cm long and has a mass of 3.7 g . The distance from the bridge to the support post is L=62cm, and the string is under a tension of 500 N . What are the frequencies of the fundamental and first two overtones?

Respuesta :

To solve this problem we will apply the concept of frequency in a string from the nodes, the tension, the linear density and the length of the string, that is,

[tex]f = \frac{n}{2L}(\sqrt{\frac{T}{\mu}})[/tex]

Here

n = Number of node

T = Tension

[tex]\mu[/tex] = Linear density

L = Length

Replacing the values in the frequency and value of n is one for fundamental overtone

[tex]f = \frac{n}{2L}(\sqrt{\frac{T}{\mu}})[/tex]

[tex]f = \frac{1}{2(62*10^{-2})}(\sqrt{\frac{500}{(\frac{3.7*10^{-3}}{90*10^{-2}})}})[/tex]

[tex]\mathbf{f = 281.2Hz}[/tex]

Similarly plug in 2 for n for first overtone and determine the value of frequency

[tex]f = \frac{n}{2L}(\sqrt{\frac{T}{\mu}})[/tex]

[tex]f = \frac{2}{2(62*10^{-2})}(\sqrt{\frac{500}{(\frac{3.7*10^{-3}}{90*10^{-2}})}})[/tex]

[tex]\mathbf{f = 562.4Hz}[/tex]

Similarly plug in 3 for n for first overtone and determine the value of frequency

[tex]f = \frac{n}{2L}(\sqrt{\frac{T}{\mu}})[/tex]

[tex]f = \frac{3}{2(62*10^{-2})}\bigg (\sqrt{\frac{500}{(\frac{3.7*10^{-3}}{90*10^{-2}})}} \bigg)[/tex]

[tex]\mathbf{f= 843.7Hz}[/tex]