Question

The energy equivalent of $1\text{kg}$ of a substance is

• A. $4.5\times {10}^{15}\text{J}$
• B. $4.5\times {10}^{16}\text{J}$
• C. $9\times {10}^{13}\text{J}$
• D. $9\times {10}^{16}\text{J}$

Answer 1

The correct option is D $9\times {10}^{16}\text{J}$

Acoording to mass- energy relation, energy in terms of mass is given by,

$E=m{c}^2$, where $E=\text{energy},m=\text{mass},c=\text{speed of light}$
So,

$E=1\times (3\times {10}^8{)}^2$

$=9\times {10}^{16}\text{J}$