First slide

Physical quantities and units

Question

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 $(1 a m u = 1.67 \times 10^{- 27} k g)$

Moderate

A

0.5073 MeV
B

0.693 MeV
C

4.0093 MeV
D

None of these

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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