A metallic surface is illuminated with monochromatic light of wavelength λ and stopping potential for photoelectric current is $$5vo$$ when the same metallic surface is illuminated with a light of wavelength $$2$$λ , the stopping potential is Vo . What is the threshold wavelength for the surface ?

Question

A metallic surface is illuminated with monochromatic light of wavelength λ and stopping potential for photoelectric current is $$5vo$$  when the same metallic surface is illuminated with a light of wavelength $$2$$λ , the stopping potential is Vo . What is the threshold wavelength for the surface ?

Infinity Learn · Accepted Answer

hcλ$$=$$ϕ$$+e5Vo$$ ..$$.1hc2$$λ$$=$$ϕ$$+eVo$$ ..$$.2$$∴$$2$$ϕ$$+eVo=$$ϕ$$+5eVo$$⇒ϕ$$=3eVo$$⇒hcλ$$o=3eVo$$⇒λ$$o=hc3eVoFrom$$ (1)   hcλ$$=3eVo+5eVo$$⇒$$hc3eVo=8$$λ$$3$$∴ λ$$o=8$$λ$$3$$

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A metallic surface is illuminated with monochromatic light of wavelength λ and stopping potential for photoelectric current is 5vo when the same metallic surface is illuminated with a light of wavelength 2λ , the stopping potential is Vo . What is the threshold wavelength for the surface ?

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Ready to Test Your Skills?

free study material