Question

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

• 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 $63\times {10}^{10}J$

$△m=1-0.993=0.007gm$

$\therefore E=\left(△m\right)c^2=(0.007\times {10}^{-3}){(3\times {10}^8)}^2=63\times {10}^{10}J$