Editor
The energy equivalent to 0.9 mg is?
Difficulty: Easy
A: 
$9\times 10^{9}\,\,\rm{J}$
B: 
$8.1\times 10^{13}\,\,\rm{J}$
C: 
$8.1\times 10^{59}\,\,\rm{J}$
D: 
None of these
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