ch38-p045 - 45(a The momentum of the photon is given by p =...

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The wavelength is 6 9 1240eV nm 1.24 10 nm 1.24 fm. 1.00 10 eV hh c pp c λ= = = = × = × 45. (a) The momentum of the photon is given by p = E / c , where E is its energy. Its wavelength is = = = h p hc E 1240 100 1240 eV nm eV nm. . (b) The momentum of the electron is given by pm K = 2 , where K is its kinetic energy and m is its mass. Its wavelength is = h p h mK 2 . If K is given in electron volts, then 34 9 1/2 1/2 31 19 J s 1.226 10 m eV 1.226nm eV . 2(9.109 10 kg)(1.602 10 J/eV) KK K −− 6.626×10 × = = ×× For 1.00 eV K = , we have 1/2 1.226nm eV
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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