Length of the piano string =76cm = 0.76 m
"\\mu" = 6.91 x 10-3 kg/m
Tension of the value(T)= 40N
"f=[\\frac{T}{\\mu}]^{\\frac{\\frac{1}{2}}{2L}}"
"f=[\\frac{40}{6.91 * 10^{-3}} ]^{\\frac{\\frac{1}{2}}{2*0.76}}"
"f = 50.1 Hz"
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