Two identical piano wires have a fundamental frequency of 494 Hz when kept under the same tension. What fractional increase in the tension of one wire will lead to the occurrence of 5 beats/s when both wires oscillate simultaneously?

Respuesta :

Answer:0.0203

Explanation:

Given

Fundamental frequency[tex]\left ( f_1\right ) =494 Hz[/tex]

[tex]\Delta f=5 beats/s[/tex]

[tex]f_2-f_1=5[/tex]

[tex]f_2=499 Hz[/tex]

[tex]f_1=\frac{1}{2l}\sqrt{\frac{T_1}{\mu }}---------1[/tex]

[tex]f_2=\frac{1}{2l}\sqrt{\frac{T_2}{\mu }}-------2[/tex]

Divide (1)&(2)

[tex]\frac{f_1}{f_2}=\sqrt{\frac{T_1}{T_2}}[/tex]

[tex]\frac{T_2}{T_1}=\left (\frac{f_2}{f_1} \right )^2[/tex]

[tex]\frac{T_2}{T_1}-1=\left (\frac{f_2}{f_1} \right )^2-1[/tex]

[tex]\frac{T_2}{T_1}-1=0.0203[/tex]

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