The energy equivalent of 0.5 g of a substance is :
4.5 \times 10^{16} J
4.5 \times 10^{13} J
1.5 \times 10^{13} J
0.5 \times 10^{13} J
From mass-energy equivalence, E=mc2E = mc^2E=mc2. m=0.5 g=0.5×10−3 kgm = 0.5 \text{ g} = 0.5 \times 10^{-3} \text{ kg}m=0.5 g=0.5×10−3 kg. c=3×108 m/sc = 3 \times 10^8 \text{ m/s}c=3×108 m/s. E=(0.5×10−3)×(3×108)2=0.5×10−3×9×1016=4.5×1013 JE = (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}E=(0.5×10−3)×(3×108)2=0.5×10−3×9×1016=4.5×1013 J.
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