A certain metallic surface is illuminated with monochromatic light of wavelength, λ. The stoppi

Question

A certain metallic surface is illuminated with monochromatic light of wavelength, &#955;. The stopping potential for photo-electric current for this light is 3V0. if the same surface is illuminated with light of wavelength 2&#955;, the stopping potential is V0. The threshold wavelength for this surface for photoelectric effect is :-

Accepted Answer

Stopping potential = Incident energy - Emitted energy

Emitted energy is constant in both case hc/λ₀ (λ_{0 =} thresold wavelegth )

φ = hc/λ - hc/λ₀

φ = hc/2λ - hc/λ₀

λ₀= 4λ

Thus option A is correct

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