Question

The energy equivalent to a substance of mass 1 g is

• A. $18\times 10^{13}J$
• B. $9\times 10^{13}J$
• C. $18\times 10^{6}J$
• D. $9\times 10^{6}J$

Answer 1

Answer: (B)

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