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A certain string has a length $L$ and is sounding its fourth harmonic frequency of ${ f }_{ 4 }$.

Which of the following is a correct expression for the speed at which waves travel on this string?

A

$\dfrac { { f }_{ 4 }L }{ 2 } $

B

$\dfrac { { f }_{ 4 }L }{ 8 } $

C

$2{ f }_{ 4 }L$

D

$4{ f }_{ 4 }L$

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