100W = 6.24x1020 eV/s
MeV= 1,000,000 eV
Every atom of U235 gives 200 MeV of energy
1) How many atoms of U235 do you need to power one 100W bulb for 100 seconds?
2) How many grams is that?
3) How long can one 100W light bulb run off of one gram of U235?