26.1 The Origin of Sound What is the source of all sound?
26.2 Sound in Air As a source of sound vibrates, a series of compressions and rarefactions travels outward from the source.
26.2 Sound in Air Each particle moves back and forth along the direction of motion of the expanding wave. Particles moving parallel to the direction of the wave creates a longitudinal wave As the source vibrates, a series of compressions and rarefactions is produced.
26.2 Sound in Air How does a sound wave travel through air?
26.3 Media That Transmit Sound Sound travels in solids, liquids, and gases.
26.3 Media That Transmit Sound Sound cannot travel in a vacuum. Needs a medium, Longitudinal waves are mechanical waves In general, sound is transmitted faster in liquids than in gases, and still faster in solids. The denser the medium the faster the wave will travel The speed of sound in dry air at 0°C is about 330 m/s, or about 1200 km/h. This is about one-millionth the speed of light
26.3 Media That Transmit Sound What media transmit sound?