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
Concept. Mass–energy equivalence: $E = mc^2$.
Step 1. Substitute. $m = 0.5\ \text{g} = 0.5 \times 10^{-3}$ kg:
$$E = 0.5 \times 10^{-3} \times 9 \times 10^{16} = 4.5 \times 10^{13}\ \text{J}$$
Answer. $4.5 \times 10^{13}$ J (Option B).
Solution by Sreeraj P, M.Sc Physics