Posted by **sasha** on Tuesday, March 16, 2010 at 9:09pm.

If the average household uses electrical energy daily at the rate of 500. W, how much U-235 must undergo fission to supply this need for a year? (assume 200. MeV of energy are generated per fission and that the power plant is 46% efficient).

1. Energy used in Joules per year?

2. Fissions needed per year to produce the energy?

3. Mass of uranium needed to produce the fissions?

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