15.1 Velocity, Frequency, and Wavelength15.2 Wave Types15.2.1 Transverse Waves15.2.2 Longitudinal Waves15.3 General Wave Properties15.3.1 Refraction15.3.2 Superposition15.3.3 Constructive Interference15.3.4 Destructive Interference15.3.5 Tone15.3.6 Resonance15.3.7 Diffraction15.4 Distance and Velocity Measurements with Waves15.4.1 Radar, Lidar, and Sonar15.4.2 Doppler Shift15.5 Sound Waves15.5.1 Speed of Sound15.5.2 Pitch15.5.3 Ultrasound Imaging15.5.4 Ultrasonic Tape Measure15.5.5 Ultrasonic Cleaning15.5.6 Sound Pressure15.5.7 Sound Intensity15.5.8 Sound Intensity Level15.5.9 Microphones15.5.10 Gravitational Waves15.6 Chapter Summary15.6.1 Sound Intensity Level