1. Sound
Chapter 11

2. Sound
Produced by vibrating object that sends disturbance through surrounding medium (usually air)
Longitudinal waves

3. Pitch Our impression of the frequency of sound
High pitched sounds = high frequency
Low pitched sounds = low frequency

4. Media that Transmit Sound
Sound requires a medium to transmit through
Sound cannot be produced in a vacuum
Sound is produced in solids, liquids and gases
Solid > liquid > gas
Sound is transmitted louder and faster in solids

5. Speed of Sound In air, approximately 330 m/s.
If you increase temperature of air, increases speed of sound
Elastic materials transmit sound faster than inelastic materials

6. Loudness Intensity and loudness are related
Intensity of sound is proportional to the square of the amplitude of the sound wave

7. Interference Sound waves have interference
Crest of wave is area of compression in longitudinal wave
Trough = area of rarefaction

8. Destructive interference of sound waves can produce dead spots (where you cannot hear any sound)
Constructive interference produces a louder sound in those areas