Question

Energy equivalent to $4\text{g}$ of a substance is

• A. $2\times {10}^{10}\text{J}$
• B. $9\times {10}^{16}\text{J}$
• C. $6\times {10}^2\text{J}$
• D. $3.6\times {10}^{14}\text{J}$

Answer 1

The correct option is D $3.6\times {10}^{14}\text{J}$

From Einstein's mass-energy equivalence,
$E=m{c}^2$
$=(4\times {10}^{-3})\times (3\times {10}^8{)}^2$
$=3.6\times {10}^{14}\text{J}$