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Question

If work function to target material is 2.34 eV and wavelength of incident light is 4.36×107 m then minimum potential required to stop the photo current is about :

(h=6.6×1034Js)

A
1.5 V
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B
0.5 V
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C
3.5V
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D
Zero
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Solution

The correct option is A 0.5 V
Given,

Work function, ϕ=2.34eV

wavelength, λ=4.36×107m

Planck's constant,h=6.6×1034Js

By Einstein photoelectric equation,

K.E=hcλϕ

K.E=6.6×1034×3×108eV4.36×107×1.6×10192.34eV

K.E=2.838eV2.34eV

K.E=0.5eV

The kinetic energy is equal to eV0

where, V0=stopping potential

eV0=0.5eV

V0=0.5V

The correct option is B.

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