Mountain Shelter Sound Builders
0 / 12Use sound tests to help plan a trail sound station.
Listen to the test notes. Use them to answer each question.
A trail club is building a sound station at a mountain shelter. Visitors will try a drum and a speaker. First, the club tests two drum designs. An adult holds the same drum by its edge and gives it the same gentle tap each time.
Design A has nothing on the drum top. Its top moves back and forth, and a clear beat rings out. Design B has a soft pad pressed against the top. Its top barely moves, and the tap makes a short, dull sound.
Listen to the new test notes. Think about what makes the paper bits move.
An adult puts tiny paper bits on a thin, tight cover over a bowl. A speaker sits close to the bowl but does not touch it. Nobody touches the bowl during the tests. The club watches for the bits to jiggle.
With the speaker off, the bits stay still. The adult plays one low note quietly. The bits stay still. The adult plays the same note louder, at a safe volume. The bits jiggle. Next, the adult moves the bowl farther away. With the same louder note, the bits stay still. The club can still hear the note.
Use both tests to help the trail club choose and improve its designs.
In the drum test, back-and-forth makes sound. In the bowl test, makes the cover and paper bits move.