This 5E unit includes seven learning experiences in which students: 1) observe the phenomenon of sound and develop an initial model to explain how we hear (Hearing Sound), 2) use telephone cups to investigate how sound can transfer from place to place (Telephone Cups), 3) investigate transverse and compression waves (Making Waves-Compression and Transverse), 4) identify patterns in waves to interpret the relationship between frequency and wavelength (Making Waves-Frequency and Wavelength), 5) investigate how energy affects waves and sound (Making Waves-Amplitude), 6) investigate what affects sound in tubes (Sound in Tubes), and 7) develop an explanation on how sound causes objects to move (Air Cannon). In a culminating assessment, students design an instrument meeting certain criteria. They synthesize their knowledge by constructing an explanation focusing on how we hear sound from their instrument.