Have students hold the construction paper at the end of the second tube to be sure light is passing through. Direct students to stand another mirror on a piece of clay at the end of the second tube and then reflect the light from the second tube through a third tube. Students should hold the construction paper at the end of the third tube to be sure light is passing through the tube. Students change the length of stretched rubber bands and observe that the pitch of the sound produced is lowered as the length of the vibrating part of each rubber band is increased. Students will do Lab Manual pages 43-44 as they do the activity.
Students stretch plastic wrap over a soup can and sprinkle it with salt.
They observe how sound causes the plastic to vibrate and move the salt. Students will complete Lab Manual pages 41-42 as they do the activity. Students observe and describe the difference in the volume of a sound as it travels the same distance through air and wood. Students discover that sounds seem louder when they travel through wood thaan when they travel through air. Students will complete Lab.