Question

Convert 1 eV to joule.

Answer 1

1. Electron volt (eV) is the unit of electrostatic work done.
2. Electrostatic energy, W = charge(Q) × potential difference(v).
3. 1 electron volt (eV) is defined as the amount of energy acquired by an electron that gets accelerated through a potential difference of 1 volt.

$$\begin{gathered} ElectrostaticenergyW=Chargeofelectron\times Potentialdifference \\ Chargeofelectron=1.6\times {10}^{-19}C \\ Potentialdifference=1v \\ W=1.6\times {10}^{-19}\times 1 \\ =1.6\times {10}^{-19}J \\ Since,jouleisunitofenergy. \end{gathered}$$

Hence $1eV=1.6\times {10}^{-19}J$