1. Bell Work: Sound Vocabulary
When an airplane moves faster than the sound waves it produces, you hear a _____ ____.
A quiet sound always has less ______ than a loud sound.
Sound waves too low to hear are ___ and sound waves too high to hear are ___.
A human’s perception of the amplitude of a sound wave is the ________.
When a sound is louder because of an increase in force, it is __________.

2. Today: Any instruments to discuss?
Practice speed of sound and echo problems.
Work on speed of sound lab – draw graph and answer questions (due tomorrow!)
Review sheet.