{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Physics2Summarysheet

Physics2Summarysheet - Modern Physics Summary Carl Hansen...

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

▓▓▓▓▒░░▒▒▒░▒▓▓██ 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

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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
Ask a homework question - tutors are online