1. 26.1 The Origin of Sound
What is the source of all sound?

2. 26.2 Sound in Air
As a source of sound vibrates, a series of compressions and rarefactions travels outward from the source.

3. 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.

4. 26.2 Sound in Air
How does a sound wave travel through air?

5. 26.3 Media That Transmit Sound
Sound travels in solids, liquids, and gases.

6. 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

7. 26.3 Media That Transmit Sound
What media transmit sound?