Q: When 92U235 undergoes fission, 0.1 % of its original mass is changed into energy. How much energy is released if 1 kg of 92U235 undergoes fission
(a) 9 × 1010 J
(b) 9 × 1011 J
(c) 9 × 1012 J
(d) 9 × 1013 J
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Ans: (d)
Sol: E = m c2
= $\frac{1 \times 0.1}{100} \times (3 \times 10^8)^2 $
= 9 × 1013 J