Question

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. $9\times {10}^{10}J$
  
• B. $9\times {10}^{11}J$
  
• C. $9\times {10}^{12}J$
  
• D. $9\times {10}^{13}J$

Answer 1

The correct option is D $9\times {10}^{13}J$

By using $E=\Delta m.c^2\Rightarrow E=(\frac{0.1}{100}\times 1)(3\times {10}^8{)}^2=9\times {10}^{13}J$