**Universal Wave Equation Example**

According to r/EngineeringStudents, the speed of sound in *mayonnaise* is 2613 \(\textrm{ms}^{-1}\). According to Scientific American, a soprano's frequency range could be between 250 and 1500 Hz, so let's see what the wavelength of a 1200 Hz soprano tone would be as it passes through mayonnaise. For simplicity, we'll use the scalar wave speed instead of vector velocity.

\[v = \lambda f\]

Insert values.

\[2613 \textrm{ ms}^{-1} = \lambda (1200 \textrm{ Hz}).\]

Divide both sides by 1200 to solve for \(\lambda\).

\[\therefore \lambda = \frac{2613\textrm{ ms}^{-1}}{1200\textrm{ Hz}} \approx 2.18 \frac{\textrm{m}}{\textrm{s Hz}}.\]

Since Hz \(= \frac{1}{\textrm{s}}\), the units cancel and our answer is 2.18 m.