UEN Security Office
Technical Services Support Center (TSSC)
Eccles Broadcast Center
101 Wasatch Drive
Salt Lake City, UT 84112
(801) 585-6105 (fax)
1 class periods of 45 minutes each
Students experiment with various materials to identify the relationship between size of the source, vibration speed, and pitch.
For Each Group: (2-3 Students)
For the Teacher:
Sound is produced through the vibrations of compressed molecules. For instance, as the wings of a tiny hummingbird move, they collide with air molecules and compress them closely together for a moment of time. However, these molecules quickly move to their original position. But on their way, they bump into other molecules, transferring this energy. This wavelike movement produces the hum of a hovering hummingbird.
Sounds can be created using a variety of materials. During the following experiments, be aware of the kinds of energy used to create the sounds. Stress the differences of volume (intensity of the sounds wave) and pitch (how high or low the tone sounds) with each different experiment. Encourage the students to hypothesize and create their own experiments, then test and find out about the sound produced.
Four Rubber Bands
Have students apply what they have learned about vibrations and pitch to design their own musical instrument. The instruments are shared with the class. Students then work in groups to compose their own musical number which are performed for one another in the "Battle of the Bands."
Use the Science Journal Rubric to assess student entries for their experiments as well as their explanations of how human vocal chords work.