Question

The energy equivalent of $1$ g of matter is :

• A. 9 x 10${}^{13}$ joule
• B. 9 x 10${}^{13}$ erg
• C. 3 x 10${}^5$ joule
• D. 3 x 10${}^5$ erg

Answer 1

Answer: (A)

9 x 10${}^{13}$ joule

$\Delta m=1gm$
$E={10}^{-3}\times (3\times {10}^8{)}^{2}J$
$=9\times {10}^{13}J$