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Particle Decay: A pion decays via the process → + 1, emit-
ting one photon in the forward direction at an energy E₁ = 270 MeV
as measured in the lab frame. The pion has a rest mass of m
135 MeV/c².
(i) What was the speed of the º?
(ii) What is the direction of the second photon, and what is its energy
E₂?
(iii) Which force was responsible for the decay?

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