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Q.

One amu is equivalent to 931 MeV energy. The rest mass of electron is $9.1 \times 10^{- 31} k g .$ The mass energy is $(1 a m u = 1.67 \times 10^{- 27} k g)$

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a

0.5073 MeV

b

0.693 MeV

c

4.0093 MeV

d

None of these

answer is A.

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Detailed Solution

The mass of electron $= \frac{9.1 \times 10^{- 31}}{1.67 \times 10^{- 27}}$

$∴ E = \frac{9.1 \times 10^{- 31}}{1.67 \times 10^{- 27}} \times 931 M e V$

= 0.5073MeV

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