Question

1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released

• A. $63\times {10}^{7}J$
  
• B. $63\times {10}^{10}J$
  
• C. $63\times {10}^{14}J$
  
• D. $63\times {10}^{20}J$

Answer 1

The correct option is B $63\times {10}^{10}J$


$\Delta m=1-0.993=0.007gm$
$\therefore$ $E=\Delta m{c}^2=0.007\times {10}^{-3}\times (3\times {10}^8{)}^2=63\times {10}^{10}J$