Question

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

• A. $63\times 10$${}^7$J
• B. $63\times 10$${}^{10}$ J
• C. $63\times 10$${}^3$ J
• D. $63\times 10$${}^{20}$ J

Answer 1

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

$\Delta m=(1-0.993)gm$
$=0.007gm$
$=7\times {10}^{-6}kg$

$E=(7\times {10}^{-6})\times (3\times {10}^8{)}^{2}J$
$=6.3\times {10}^{11}J$