Question

# A reactor is developing energy at the rate of 32MW. Calculate the required number of fissions per second of 92U235. Assume that energy per fission is 200MeV.

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Solution

## Rate at which energy is developed Et=32MW=32×106JsEnergy generated per fission Ef=200MeV=200MeV×106eV/MeV×1.6×10−19J/eV Ef=32×10−12 JSo, number of fissions required per second N=32×106J/s32×10−12J⟹ N=1018 fissions per second

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