Q 12-13-007NEETNEET 2020Top questionEasy
The energy equivalent of $0.5$ g of a substance is :
Answer: (B) $4.5 \times 10^{13}$ J
$$E = mc^2 = 0.5 \times 10^{-3} \times (3 \times 10^8)^2 = 0.5 \times 10^{-3} \times 9 \times 10^{16} = 4.5 \times 10^{13}\ \text{J}$$
Solution by Sreeraj P, M.Sc Physics