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AP® Physics 1 & 2

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Difficult

Find String Wave Speed

APPH12-UYBOBE

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

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

A

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

B

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

C

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

D

$$4{ f }_{ 4 }L$$