New topic ... Optics / waves and light!

MECHANICAL WAVES

General equations:

Amplitude in Simple Harminoc Motion (SHM): A = $\sqrt{\mathrm{Xi^2\; +\; (V^2/\omega \; ^2)}}$
 where ω = $\sqrt{\mathrm{k/m}}$

Phase angle (SHM): Φ = arctan(-Vi/ω xi)
 where ω = $\sqrt{\mathrm{k/m}}$$$$$

Phase: (kx-ωt) is a constant wavelength: λ = 2π/ω UNIT: meter


frequency: f = 2π/ω UNIT: cycles/second

NOTE THAT ω also equals: ω = νk 

wavespeed or speed of propagation: ν = $\sqrt{\mathrm{T/\mu }}$ UNIT: meters/second

ν = fλ

k = 2π/λ 

General Transverse Equation: y(x,t) = Acos2π([x/λ]-[t/T]) 

 Tension: μv = (mass of rod/length of rod)(frequency•wavelength)


POWER

Power: P = (force)(velocity) 

 P = 4πr^2(Intensity)

Converting power to energy? multiply by Joules! 1 W = 3.6x10^3 Joules