In reading about the Fender Rhodes piano, which uses metal rods instead of strings, you come across the following equation:

$$\rho \frac { { \partial }^{ 2 }f }{ \partial { x }^{ 2 } } = Y\frac { { \partial }^{ 2 }f }{ \partial { t }^{ 2 } }$$

…where $\rho$, the rod density, and $Y$, the Young’s modulus of the rod material, are constants. Which statement below **most completely** describes what you can conclude by examining this formula?

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