http://www.ck12.org Chapter 20. Sound
Apply Concepts
- Write a public service announcement warning people of the dangers of loud sounds. Include tips for protecting
the ears from loud sounds.
Think Critically
- InFigure20.9, how are permissible exposure times related to sound intensity? Create a graph to show the
relationship.
Points to Consider
In this lesson, you read about loud sounds and their dangers. Rock concerts often produce very loud sounds. Both the
screaming fans and the highly amplified musical instruments contribute to the high decibel levels. Playing musical
instruments is one way we use sound. You’ll read about musical instruments in "Using Sound," the next lesson.
- How do you think musical instruments produce sound? In other words, how do you think they cause air to
vibrate? - How do musical instruments change the pitch of sound?