A Neutral η⁰ (Having Mass 0

question 37

Multiple Choice

A neutral η⁰ (having mass 0.642 u) that is at rest decays into two gamma ray photons.What is the energy in MeV of each photon? (1 u = 931.5 MeV/c²)

• A) 299 MeV
• B) 597 MeV
• C) 1190 MeV
• D) 199 MeV
• E) 149 MeV

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