1. Press a ruler tightly against the desk or table. Allow most of the ruler to hang over the edge. Pull down on the ruler with the other hand, release it and make it vibrate. Listen to the sound made by the vibrating ruler.

2. Slide a little more of the ruler onto the desk or table. Press the ruler on the desk and with your other hand make it vibrate again. Listen to the pitch of the sound. How does it compare to the pitch in number one?

3. Keep sliding a little more of the ruler onto the table or desk to shorten the length of the vibrating portion. Each time you shorten the length record the pitch of the sound in the table. What happens to the pitch of the sound as you shorten the length of the vibrating portion of the ruler?

4. Stretch the rubber band over the length of a textbook and place two wooden dowels or pencils underneath the rubber band at each end of the book. Gently pluck the rubber band and listen for the pitch of the sound.

5. Move the pencils closer together and pluck the rubber band again between the two pencils. Keep moving the pencils closer and plucking the rubber band in between them each time. What happens to the pitch of the rubber band as the pencils get closer together?

6. Place two more rubber bands of different thickness around the pencils and book. Pluck each individually and determine the relationship between the thickness of the rubber band and the pitch. Write your results below.

7. Fill one 12 oz soda bottle 1/3 full with water. Fill a second 12 oz bottle ½ full and a third ¾ full. 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.

Highest pitch ___________________________________

Middle pitch ___________________________________

Lowest pitch ____________________________________

8. In the bottles of water what is vibrating, making the sound?

9. 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.

Highest pitch _______________________

Medium pitch _______________________

Lowest pitch _______________________

10. What is vibrating to produce the sound, when you blow over the top of the bottle?