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# OAT Physics

### Chapter 9 - Periodic motion, waves, and Sound

TermDefinition
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
Created by: JaeBae4444