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OAT Physics
Chapter 9 - Periodic motion, waves, and Sound
| Term | Definition |
|---|---|
| SHM: F = | -kx |
| SHM a= | -w^2x |
| w = | square root of k/m for spring and square root of g/L for pendulum |
| displacement x | = X cos (wt) |
| w = | 2pif |
| PE (spring) | = 1/2kx^2 |
| Displacement of a sinusoidal wave | y = Y sin (kx-wt); k = wave number |
| v or c (speed of light) = | f times wavelength |
| wavelength of a wave | crest to crest |
| k wave number = | 2pi/wavelength |
| v = | fwavelength = w/k = wavelength/T |
| speed of sound in air | 331 m/s |
| human hearing range | 20Hz-20,000Hz |
| Intensity (I) | = P/A |
| Sound Level = | 10 log (I/E-12) |
| f of beats = | f1-f2 |
| when pipe is open | f = nv/2L cuz wavelength = 2L/n |
| when pipe is closed on one end | wavelength = 4L/n |
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