Georgia State University
Georgia State University: Hyper Physics: Speed of Sound
Physics tutorial on measuring the speed of sound in dry air. An interactive form allows the student to practice solving problems involving the temperature dependence of the speed of sound.
PBS
Pbs Teachers: Scientific American: Expedition Panama: Echoes in the Night
Explore your prior knowledge about bats and investigate bats' use of echolocation to identify and catch prey. Design a game like "Marco Polo" to demonstrate echolocation.