Astrom Notes

# Astrom Notes - Physics 20A Properties of Wave =v(wavelength...

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Physics 20A 04/10/2007 13:21:00 Properties of Wave     λυ =v (wavelength x frequency = speed) λυ =c (for speed of light in vacuum) c= universal constant of nature = 3x10^8 m/s Energy of Photon     E=h υ h=Planck’s Constant=6.63x10^-34 Jsec Wien’s Law     λ maxT=2.9x10^7  Λ K (wavelength at which spectrum peaks x Surface temp= 2.9x10^7  Λ K) Stefan-Boltzmann Law      (Luminosity of a black-body) L= σ T^4 x surface area Where  σ =5.67x10^-8 W/m^2 K^4 Surface Area of sphere= 4pie(radius)^2 Stellar Parallax      d=1/p   distance (in parallax) = 1/parallax angle (in arcseconds) 1 parsec= 3.26 lt years Inverse Square Law     b= l/4pie*d^2 apparent brightness=Luminosity/4pie*d^2 Mass-Luminosity Relation     For main sequence stars, L =(approx)= M^4 L=luminosity, M=mass

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Physics 20A 04/10/2007 13:21:00 Units of Measurement
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## This note was uploaded on 04/20/2008 for the course PHYS 20A taught by Professor Staff during the Fall '02 term at UC Irvine.

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Astrom Notes - Physics 20A Properties of Wave =v(wavelength...

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