Question

The energy equivalent of 0.5 g of a substance is:

• A. $4.5\times 10^{16}J$
• B. $4.5\times 10^{13}J$
• C. $1.5\times 10^{13}J$
• D. $0.5\times 10^{13}J$

Answer 1

Answer: (B)

From mass-energy equivalence,
$E=m{c}^2$
$=0.5\times 10^{-3}\times 9\times 10^{16}$
$=4.5\times 10^{13}J$