Frequency Sets Wavelength - Biophysical Ultrasound: Echo Timing and Acoustic Interfaces Step by Step

The wavelength is fixed by sound speed divided by frequency. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Wavelength is speed divided by frequency

Sound speed 12 meters per second divided by frequency 3 hertz gives wavelength 4 meters.

\lambda=\frac{12}{3}=4\ \text{m}

The small frequency is a training value

The value 3 hertz is chosen so the wavelength stays exact at 4 meters.

12\ \text{m/s}=3\ \text{Hz}\cdot 4\ \text{m}