An electron charge 1.6 x 10-19C is accelerated in vacuum from rest at zero volt...

WAEC 1991

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

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Correct Answer: Option D

Explanation

E = \(\frac{1}{2}QV = \frac{1}{2} \times 1.6 \times 10^{-19} \times 40000\)

= 3.2 x 10^-15J

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An electron charge 1.6 x 10-19C is accelerated in vacuum from rest at zero volt...

Correct Answer: Option D

Explanation

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