which do you need to calculate the speed of a wave?
To calculate the speed of a wave you need its frequency ( Hz) and wavelength
Once you have it slot in into this equation c = f * λ
where c =speed of the wave
f = frequency
λ = wavelength
Hope this helps :).
Speed, v = fλ
where f = frequency in Hz, and λ = wavelength in m.
Hence to calculate the speed, you need to the know the value of the frequency and wavelength of the wave.