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A mercury arc lamp provides 0.1 W of ultra-violet radiation at a wavelength of λ=2537∘A only. The photo tube (cathode of photo electric device) consists of potassium and has an effective area of 4 cm2. The cathode is located at a distance of 1m from the radiation source. The work function for potassium is ϕ0=2.2 eV.What is the cut off potential V0 ? |
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Answer» A mercury arc lamp provides 0.1 W of ultra-violet radiation at a wavelength of λ=2537∘A only. The photo tube (cathode of photo electric device) consists of potassium and has an effective area of 4 cm2. The cathode is located at a distance of 1m from the radiation source. The work function for potassium is ϕ0=2.2 eV. |
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