- Ex 3D, p. 75-79 Standing Waves and Music
- Ex 3E, p. 81-84 Beats
Standing Waves
in musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber
Harmonic
|
String
|
Double Open Ended Pipe
|
Closed Ended Pipe
|
1st
|
𝜆 = 2L
f = f1st
|
𝜆 = 2L
f = f1st
|
𝜆 = 4L
f = f1st
|
2nd
|
𝜆 = L
f = 2f1st
|
𝜆 = L
f = 2f1st
| |
3rd
|
𝜆 = ⅔ L
f = 3f1st
|
𝜆 = ⅔ L
f = 3f1st
|
𝜆 = 4/3 L
f = 3f1st
|
4th
|
𝜆 = ½ L
f = 4f1st
|
𝜆 = ½ L
f = 4f1st
| |
5th
|
𝜆 = ⅖ L
f = 5f1st
|
𝜆 = ⅖ L
f = 5f1st
|
𝜆 = ⅘ L
f = 5f1st
|
Standing Waves Part I: Demonstration
Standing Waves Part II: Explanation
Standing Waves
Making standing waves
Singing plates - Standing Waves on Chladni plates
Acoustic Levitation in ULTRA SLOW MOTION
Beats
two waves of a similar frequency (similar wavelength) superimpose to come in and out of phase causing constructive and deconstructive interference respectively. This causes a warbling/beat sound of frequency (fb) equal to the difference in respective frequencies
fb = | f1 - f2 |
Wave Beats
Easy Beats- Physics
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