PHYS 1750: SELECTED TOPICS in PHYSICS
LECTURE 26 and 27. Wave Motion
15.9. | The Wave Equation | ||
1. | Speed v | ||
2. | Wavelength λ | ||
3. | Frequency f | ||
4. | Phase: position along wave, between 0 and 2π | ||
5. | v = f λ | ||
Waves on a String | |||
v = sqrt (T / μ) | |||
T = tension, μ = mass / length | |||
15.10. | Superposition | ||
1. | One wave on another; neither "knows" of the other's existence | ||
2. | Interference | ||
a. | Constructive | ||
b. | Destructive | ||
3. | Reflection | ||
a. | Hard reflection | ||
b. | Soft reflection | ||
4. | Standing Waves | ||
a. | Nodes | ||
b. | Fundamental and harmonics | ||
c. | fn = ( n / 2L ) v | ||
d. | n: harmonic number | ||
5. | Beats: fb= f1-f2 |