Interactions of Sound Waves:

Objectives:

    1.    Describe how sound waves interfere with each other.

    2.    Describe beats.

Resources:

 

Notes:

Wave Interactions: Interference.

Remember that sound is the result of the interpretation of a longitudinal wave.  Like any wave, sound waves interfere with each other when they come in contact with each other.

Combining Sounds:

Constructive interference

 

(www.xprt.net/~rcrowley/AVclass/ images/Aud-In4.gif)

Destructive interference :

(www.xprt.net/~rcrowley/AVclass/ images/Aud-In5.gif)

Music & Noise:

Music has 3 characteristics

  superposition

(library.thinkquest.org/.../Images/ Images/pictures/beats.gif)

Noise:

        Is an unwanted sound

        No pleasing qualities

        No identifiable pitch

        No definite repeatable rhythm

When noise reaches a level that causes pain or damage it is noise pollution.