Question

Kinetic energy of an electron accelerated in a potential difference of 100 V, will be

• A. $ 1.6\times {{10}^{-21}}J $
• B. $ 1.6\times {{10}^{-23}}J $
• C. $ 1.6\times {{10}^{-10}}J $
• D. $ 1.6\times {{10}^{-16}}J $

Answer 1

Answer: (D)

Potential difference V= 1000 V The kinetic energy of a electron $ 1\,eV=1.6\times {{10}^{-19}}J $ Hence, the kinetic energy of the electron is $ =1000\,eV $ $ =1.6\times {{10}^{-19}}\times 1000 $ $ =1.6\times {{10}^{-16}}J $