Question: 4. A 3 MeV photon interacts with a lead nucleus and creates an electron-positron pair. The elec- tron and positron travel perpendicular to the

4. A 3 MeV photon interacts with a lead nucleus and creates

4. A 3 MeV photon interacts with a lead nucleus and creates an electron-positron pair. The elec- tron and positron travel perpendicular to the initial direction of travel of the photon. Find the kinetic energy of the lead nucleus. mc of electron is = 0.511 MeV Mass Energy of lead nucleus is (mc) = 193007 MeV

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