p41_041 - the electron has non-zero mass, E/c and p cannot...

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41. Suppose an electron with total energy E and momentum p spontaneously changes into a photon. If energy is conserved, the energy of the photon is E and its momentum has magnitude E/c .N owt h e energy and momentum of the electron are related by E 2 =( pc ) 2 +( mc 2 ) 2 ,so pc = p E 2 ( mc 2
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Unformatted text preview: the electron has non-zero mass, E/c and p cannot have the same value. Hence, momentum cannot be conserved. A third particle must participate in the interaction, primarily to conserve momentum. It does, however, carry oF some energy....
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