Sound also moves in waves and is created by vibrations. Move one of the cards at the end to show how the light stops and does not bend around the cards. Place the cards so that the light shines through all three holes.Turn off the lights and turn on your flashlight.Be sure to place them where the holes line up. Make sure that the cards are standing at an equal distance from each other.Next, take the clay or tape and place the cards so that they are standing up.(be sure that they are all in the same place. Take the 3 index cards and poke a hole in the center of each card.Small balls of modeling clay or sticky tack.
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