Question

# In a photo-electric effect experiment, photons of energy 5 eV are incident on a metal surface. They liberate photo-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 is :

A
1.5 eV
B
3.5 eV
C
5. 0 eV
D
8.5 eV

Solution

## The correct option is B 1.5 eVKinetic Energy lost due to stopping potential $$=e \times 3.5$$ V                                                                            $$= 3.5 eV$$So,From the question, the photoelectric equation becomes,$$5 - W = 3.5$$$$\Rightarrow W = 1.5$$  eVSo, the answer is option (A).Physics

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