$$v = f \lambda$$
where:
* v is the wave speed in meters per second (m/s)
* f is the frequency of the wave in hertz (Hz)
* λ is the wavelength of the wave in meters (m)
If you know the frequency of the wave but not the wavelength, you can rearrange the formula to solve for the wavelength:
$$\lambda = \frac{v}{f}$$
Once you know the wavelength, you can use the formula above to calculate the wave speed.
For example, if a wave has a frequency of 100 Hz and a wavelength of 2 meters, then its wave speed is:
$$v = f \lambda = (100 \text{ Hz})(2 \text{ m}) = 200 \text{ m/s}$$
