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23 Nov 2019
The Nobel Prize for physics was awarded to Robert Hofstadter forexperimental work involving scattering of 20-GeV electrons fromatomic nuclei.
(a) what is the de Broglie wavelength of a beam of 20-GeVelectrons?
(b) how does this wavelength compare to typical size of an atomicnucleus, which is about 10-15 m? (It is impossible toexamine objects with kind of beam whose wave length is much largerthan object in question: the beam will diffract around the objectrather than reflect from it and will thus not produce a sharpimage.)
(c) Does it much matter whether the "20 GeV" here refers to thetotal or just the relativistic kinetic energy of the electrons?
The Nobel Prize for physics was awarded to Robert Hofstadter forexperimental work involving scattering of 20-GeV electrons fromatomic nuclei.
(a) what is the de Broglie wavelength of a beam of 20-GeVelectrons?
(b) how does this wavelength compare to typical size of an atomicnucleus, which is about 10-15 m? (It is impossible toexamine objects with kind of beam whose wave length is much largerthan object in question: the beam will diffract around the objectrather than reflect from it and will thus not produce a sharpimage.)
(c) Does it much matter whether the "20 GeV" here refers to thetotal or just the relativistic kinetic energy of the electrons?
Keith LeannonLv2
31 Aug 2019
