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QUIZ 4 PHYSICS 2D WINTER QUARTER 2010 Professor S.K.Sinha Formulas and constants Mass of electron = 9.1. 10 -31 kg Charge on electron = 1.6.10-19 C Planck’s Constant h= 6.626. 10-34 J.s =4.136. 10-15 eV.s h / 2 1.055.10 34 J.s 6.582.10 16 eV.s 1 eV =1.6. 10-19 J Coulomb’s constant k 1 / (4 0 ) 8.99.109 N.m2 / kg2 Velocity of light c = 3.108 m/s Bohr’s quantization for Angular momentum mvr nh Bohr radius a0 =0.529. 10-10 m = (h-bar) 2/meke2 1 Rydberg (Energy required to ionize hydrogen atom) =13.6 eV Rydberg Constant R = 1.097. 107 m-1 Energy of photon E = hf For photon f = c Force due to Electric field : F qE Force due to Magnetic Field: F qvxB Drag Force on drop of radius and velocity in medium of viscosity (always opposite to direction of v) : D 6v Cv Energy levels of H atom in Bohr’s theory En = -(ke2/2a0)(1/n2) =13.6/n2 eV Compton formula - = (h/mec)(1 – cos ) Bragg’s Law n =2 d sin (n=1,2,……)