Method to measure speed of ripples on a water surface

Use a signal generator attached to a ripple tank to create waves of a set frequency Use a lamp to see wave crests on a screen below the tank [wave shadows should be same size as actual wave crests Distance between each shadow line is equal to one wavelength Measure the distance between 10 wavelengths apart and then divide by 10 to find the average wavelength Use an equation to calculate the speed of the waves