The work function of a metal is 4.65ev and the metal is illuminated with a...

WAEC 1991

The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?

A. 1.48ev
B. 2.21ev
C. 4.42ev
D. 5.75ev
E. 11.51ev

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Correct Answer: Option B

Explanation

K.E = \(\frac{1}{2}\)mv²

E - W = 6.86 - 4.65

= 2.21ev

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The work function of a metal is 4.65ev and the metal is illuminated with a...

Correct Answer: Option B

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