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Q.

In a photoelectric effect experiment, photons of energy 5 eV are incident on metal surface. They liberate electrons which are just stopped by an electrode at a potential of 3.5 V with respect to metal. The work function of the metal surface in V is :

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a

7

b

3.5

c

1.5

d

5

answer is C.

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Detailed Solution

Stopping potential is equal to the maximum kinetic energy. Thus

Stopping potential =(KE)max

=3.5eV

∴W=5−3.5 

=1.5eV

 

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