An electron charge 1.6 x 10-19C is accelerated in vacuum from rest at zero volt towards a plate at 40k V. Calculate the kinetic energy of the electron
A
4.0 x 10-26J
B
4.0 x 10-21J
C
6.4 x 10-20J
D
3.2 x 10-15J
E
2.5 x 10-20J
Verified Correct Answer: D.
Physical Principles & Numerical Solution
E = \(\frac{1}{2}QV = \frac{1}{2} \times 1.6 \times 10^{-19} \times 40000\)
= 3.2 x 10-15J
Source: Myschool Past Questions Archive (Record #33450)