A y ray can produce an electron-positron pair in the neighborhood of an electron at rest as well as a nucleus. Show that in this case the threshold energy is 4moc2. (Hint: Do not ignore the recoil of the original electron, but assume that all three particles move off together.) (b) What is the minimum voltage needed across an x-ray tube if the subsequent bremsstrahlung radiation is to be capable of pair production?
A y ray can produce an electron-positron pair in the neighborhood of an electron at rest as well as a nucleus. Show that in this case the threshold energy is 4moc2. (Hint: Do not ignore the recoil of the original electron, but assume that all three particles move off together.) (b) What is the minimum voltage needed across an x-ray tube if the subsequent bremsstrahlung radiation is to be capable of pair production?
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Transcribed Image Text:28. A y ray can produce an electron-positron pair in the neighborhood of an electron at rest
as well as a nucleus. Show that in this case the threshold energy is 4moc². (Hint: Do not
ignore the recoil of the original electron, but assume that all three particles move off
together.)
25. (b) What is the minimum voltage needed across an x-ray tube if the subsequent
bremsstrahlung radiation is to be capable of pair production?
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