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 :
3.5 eV
1.5 eV
5. 0 eV
8.5 eV
A
5. 0 eV
B
3.5 eV
C
1.5 eV
D
8.5 eV
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Solution
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Kinetic Energy lost due to stopping potential =e×3.5 V =3.5eV So, From the question, the photoelectric equation becomes,
5−W=3.5
⇒W=1.5 eV
So, the answer is option (A).
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