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Q.

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

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a

5

b

3.5

c

1.5

d

8.5

answer is C.

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Detailed Solution

Wo = E – KEmax  = E – eVs  = 5 eV – e(3.5V)= 5 eV – 3.5 eV = 1.5 eV
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