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Question

One gram of hydrogen is converted into 0.993 grams of helium in a thermonuclear reaction. The energy released is

A
63×107 J
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B
63×1010 J
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C
63×1014 J
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D
63×1020 J
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Solution

The correct option is B 63×1010 J
Using rest mass energy equivalence,
ΔE=Δmc2
Δm=(1.0000.993) g=0.007 g

ΔE=0.007×9×1016 mJ
ΔE=63×1013 mJ=63×1010 J

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