2 1 Fill in the missing steps to plan an investigation to test the 2 relationship between wave frequency and wavelength. 1 Set up the ripple tank as shown. 2 Tap the surface of the water with a pencil every 2 seconds. 3 Measure the distance between five wave crests and calculate the 4 Tap the surface of the water with a pencil every 4 seconds. 5 Measure the distance between wave crests and calculate the Tant cil