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Unformatted text preview: = hc 2 Kmc 2 (2) we have 2 = ( hc ) 2 2 Kmc 2 , (3) and therefore K = ( hc ) 2 2 2 mc 2 = (1240 eV nm) 2 2(1 . 0 nm) 2 (511 , 000 eV) = 1 . 50 eV . (4) Since this value for K clearly satises K mc 2 , the electrons are indeed nonrelativistic, and we were justied in using the nonrelativistic formula. The corresponding potential dierence between the two plates of the electron gun is 1.50 V. 1...
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This note was uploaded on 03/07/2011 for the course PHYS 274 taught by Professor Ericszarmes during the Spring '11 term at University of Hawaii, Manoa.
 Spring '11
 EricSzarmes
 Physics, Energy, Kinetic Energy, Work

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