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Mass Energy Equivalence

Using E = m...

Question

Using $E = m c^{2}$ , find out the energy released, when $2 u$ of mass is destroyed completely.
Take $1 u = 1.66 \times 10^{- 27} k g$ .

4.65 M e V

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3627 M e V

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91.5 M e V

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1865 M e V

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Solution

The correct option is D $1865 M e V$
When $2 u$ of mass is destroyed completely then
$△ m = 2 u E = △ m c^{2} E = 2 \times 931 M e V ∴ 1 u = 931 M e v / c^{2} S o, E = 1863 M e V \approx 1865 M e V$
So, (D) is correct option.

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