Q: When _{92}U^{235} undergoes fission, 0.1 % of its original mass is changed into energy. How much energy is released if 1 kg of _{92}U^{235} undergoes fission

(a) 9 × 10^{10} J

(b) 9 × 10^{11} J

(c) 9 × 10^{12} J

(d) 9 × 10^{13} J

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Ans: (d)

Sol: E = m c

^{2}= $\frac{1 \times 0.1}{100} \times (3 \times 10^8)^2 $

= 9 × 10^{13} J