Show that a moving electron cannot spontaneously change into an x-ray photon in free space. A third body (atom or nucleus) must be present.Why is it needed? (Hint: Examine the conservation of energy and momentum.)

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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Show that a moving electron cannot spontaneously change
into an x-ray photon in free space. A third body (atom or nucleus)
must be present.Why is it needed? (Hint: Examine the conservation
of energy and momentum.)

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