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# Download QUIZ 4 ... Formulas and constants Mass of electron = 9.1. 10

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Transcript
```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  6v  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,……)
```
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