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?

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

Correct Answer:

Option B = 2.21ev

Explanation

K.E = ½mv²

E – W = 6.86 – 4.65

= 2.21ev

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