Use a ripple tank to measure frequency and wavelength of the waves then use the wave equation to calculate wave speed How can you calculate wavelength on a ripple tank. Turn on its light. Your ripple tank is set up for you.
The velocity of wave pulses is easier to measure but they do not travel at the proper wave speed so is not appropriate.
Students are introduced to using the stroboscope to freeze waves in a ripple tank and to confirm the relationship between wave speed frequency and wavelength. The velocity of wave pulses is easier to measure but they do not travel at the proper wave speed so is not appropriate. You dont need to adjust it. The relationship between the speed frequency and wavelength is best found from a simple example.