1. PROPERTIES OF SOUND
PROPERTIES OF SOUND

2. REFLECTION When sound is reflected an echo is formed.
If the echo follows very close to the original sound its called a reverberation.

3. PROPERTIES OF SOUND
Acoustics- the study and control of sound.

4. To eliminate any reflected sound audiologist use an anechoic chamber.

5. USES FOR REFLECTION

6. REFRACTION
Sound waves will bend when there is a change in the temperature of the air.

7. INTERFERENCE
Interference of sound waves is the reason for beats in music and sonic booms.
Waves experience constructive interference when the plane travels faster than the speed of sound.

8. Constructive Interference
Regular Speed
Increased speed
Constructive Interference
Faster than sound
BOOM

9. DOPPLER EFFECT The apparent change in sound frequency
as an object moves.
☺ As the car moves toward you the pitch increases.
☺As it moves away, the pitch decreases

11. RESONANCE
When an object vibrates at its natural frequency due to another vibration.
Tacoma Narrows Bridge in the state of Washington November 7, 1940

12. Resonance of sound http://www.youtube.com/watch?v=ULiNR-k4m70