Solve the all parts of given problemproblem a 4 mev photon, Ask an Expert

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Solve the all parts of given problem:

Problem: A 4 mev photon brings about pair production in a piece of material. assume the electron and positron pair move in opposite direction with equal speed.

Part A: What is the kinetic energy of the positron?

Part B: What is the speed of the positron as measured by an observer in the lab?

I need help to find the speed of the positron as measured by an observer in the lab.

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