Question

The energy equivalence of $2\text{g}$ of a substance is -

• A. $1.8\times {10}^{10}\text{J}$
• B. $1.8\times {10}^{12}\text{J}$
• C. $1.8\times {10}^{13}\text{J}$
• D. $1.8\times {10}^{14}\text{J}$

Answer 1

The correct option is D $1.8\times {10}^{14}\text{J}$

From Einstein’s mass-energy equivalence,

$E=m{c}^2$

$=2\times {10}^{–3}\times (3\times {10}^8{)}^2=1.8\times {10}^{14}\text{J}$