Question

1 MeV is equal to __________ .

• A. 1.6×10^-19 J
• B. 1.6×10^-14 J
• C. 1.6×10^-13 J
• D. 1.6 × 10¹³ J

Answer 1

The correct option is C

1.6×10^-13 J

Conversion of 1 MeV into joules

1. 1 electron volt is defined as the energy gained by an electron when it gets accelerated through a potential difference of 1 volt.
2. It also can be defined as the amount of work done required to move an electron on a potential difference of 1 volt.
3. $$\begin{gathered} 1eV=1.6\times {10}^{-19}J \\ 1mega=1m={10}^6 \\ 1meV=1.6\times {10}^{-19}J\times {10}^6 \\ =1.6\times {10}^{-13}J \end{gathered}$$

Hence, option (c) is correct.