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A neutral pion 770 (rest energy = 135.0 MeV) produced in a high-energy particle experiment moves at a speed of 0.851c. After a very
short time, it decays into two y-ray photons. One of the y-ray photons has an energy of 126 MeV. What is the energy (in MeV) of the
second y-ray photon? Take relativistic effects into account.
Number i
Before decay
Units
E
mm
After decay
E₂
mu

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