Physics
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
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D.
3.2 x 10-15J
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E.
2.5 x 10-20J
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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