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PHY2D_Quiz5

# PHY2D_Quiz5 - of 120º and is then made to fall on a Copper...

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QUIZ 5 PHYSICS 2D SPRING QUARTER 2009 Professor S.K.Sinha Formulas and constants Mass of electron m e = 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 = 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 ) = 8.99.10 9 N . m 2 / kg 2 Velocity of light c = 3.10 8 m/s Energy of photon E = hf For photon λ f = c Compton formula λ′ - λ = (h/m e c)(1 – cos ϕ ) Bragg’s Law n λ =2 d sin θ (n=1,2,……) (1)An X-Ray photon is Compton scattered by an electron through an angle
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Unformatted text preview: of 120º, and is then made to fall on a Copper crystal of d-spacing 1.8 .10-10 m. The first order Bragg diffraction peak is observed at a Bragg angle of 3º. Calculate the energy (in KeV) of the original X-Ray photon. (2) An electron in an electron microscope is accelerated through a potential difference of 8 KV. (This is still slow enough that you don’t have to use relativity). Calculate (a) the momentum (in Kg. m/s) and (b) the wavelength (in m) of the electron at the end of the acceleration....
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