In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function of the photo sensitive material is :

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Solution

Q.
In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function of the photo sensitive material is : [2024]

1 2.48 eV

2 0.5 eV

3 1.98 eV

4 1.68 eV

Ans.
(3)

$e V_{s} = h ν - ϕ$

$0.5 e V = 2.48 e V - ϕ$

Work function, $ϕ = (2.48 - 0.5) e V = 1.98 e V$

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