Tap on each bottle with a pencil and compare the pitch of the sound coming from each one. List the bottles from highest to lowest pitch. Use water levels inside to designate the different bottles. Use the three 12 oz bottles again, but this time instead of tapping the bottles blow over the tops and try to produce a sound in each one. List the bottles from highest to lowest pitch.
Extensions Ask the students to use more soda bottles.
Fill each one with a different amount of water amounts of water and by either blowing over or by taping the sides of the bottles, play a simple song. They can perform their songs in front of the class. These students can work with partners or in small groups. Click here for further information on laboratories with students with special needs. State the relationship between the thickness of a vibrating object and its pitch.