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Question

When 92U235 undergoes fission, 0.1% of its original mass is changed into energy. 9×10xJ of energy is released if 1 kg of 92U235 undergoes fission, then the value of x is ___
  1. 92
  2. 33
  3. 23
  4. 13


Solution

The correct option is D 13
Given,

Mass defect = 0.1% of 1 kg

By using E = Δm.c2, where E = Energy, Δm = Mass defect and c = Speed of light

E = (0.1100×1)(3×108)2 = 9×1013J.

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