p39_049 - = h 2 mK . IF K is given in electron volts, then...

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49. We substitute the classical relationship between momentum p and velocity v , v = p/m into the classical defnition oF kinetic energy, K = 1 2 mv 2 ,toobta in K = p 2 / 2 m .He re m is the mass oF an electron. Thus p = 2 mK . The relationship between the momentum and the de Broglie wavelength λ is λ = h/p , where
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Unformatted text preview: = h 2 mK . IF K is given in electron volts, then = 6 . 626 10 34 J s p 2(9 . 109 10 31 kg)(1 . 602 10 19 J / eV) K = 1 . 226 10 9 m eV 1 / 2 K = 1 . 226 nm eV 1 / 2 K ....
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