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  4. The energy equivalent to a substance of mass 1 g is

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Q. The energy equivalent to a substance of mass 1 g is

KCETKCET 2018Nuclei

Solution:

$E = mc^2 = 1 \times 10^{-3} \times (3 \times 10^8)^2 $
$= 9 \times 10^{13}\,J$