Physics2Summarysheet - Modern Physics Summary Carl Hansen...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
▓▓▓▓▒░░▒▒▒░▒▓▓██ Modern Physics Summary Carl Hansen Intensity ≡ Power/Area…units :kg/(m*sec 3 ) = watts/m 2 ; Point source Intensity = P/(4π*r 2 ) Poynting Vector: “a vector with instantaneous intensity as magnitude for E/M waves” B E * 1 S 0 × μ = , also 0 light 2 * v | E | S μ = = 0 2 light | B | * v μ ; For average intensity: max max 0 rms B E * 2 1 S × μ = ; E/M wave pressure: P = F/A; for absorptions: P = Intensity/| light v | ; for reflections: P = 2*Intensity/| light v | Sound: Intensity = ½ 2 max 2 sound ) x ( * * v * ϖ ρ ; && Intensity = ) ) v ( * * 2 /( ) essure Pr ( 2 sound 2 ρ ; Sound Decibel Level: )) 10 /(ln( ) I / I ln( * 10 ) I / I ( log * 10 0 0 10 = = β ; ……Index of Refraction: n= ) v /( v mat , light light During refraction, wavelength & speed changes: λ=λ 0 /n; Diffraction: when light bends in to shadows Single slit diffraction: dark fringes @ aperture*sin(θ)=#*λ, where # means dark spot number Circular aperture: sin(θ)=1.22*λ/diameter; Double slit: bright fringes @ d*sin(θ)=#*λ, #=0,1,2… Photon energy: E=h*f; Photoelectric Fxt: q*V stopping =KE max =h*f–Φ, (Φ is the work function) DeBroigle λ: λ=h/momentum; Heisenberg uncertainty: Δx*Δp ³ ħ; Matter Wave: Ψ(x,t) Probability of finding it: Ψ 2 1 x x 2 dx ) t , x ( ; probability density= Ψ 2 (x,t);;;;; in above Δ means “error” E fermi =(3/(16π√(2))) 2/3 *h 2 /m e- *(charge carrier density) 2/3 ; FYI : (3/(16π√(2))) 2/3 =0.122 n-type semiconductor: doped w/ P; p-type semiconductor: doped w/ Al; Diode in forward bias current flows forward bias: p-type connected to + voltage, reverse bias: n-type connected to +voltage
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/22/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

Page1 / 2

Physics2Summarysheet - Modern Physics Summary Carl Hansen...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online