Consider white light whose wavelength spread is from 400 nm to 700 nm . Its energy is uniformly distributed in this spectrum (i.e. d E d = constant, where d E is the energy of the photons wavelengths between and +d ). The light is incident

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Consider white light whose wavelength spread is from 400 nm to 700 nm . Its energy is uniformly distributed in this spectrum (i.e. d E d = constant, where d E is the energy of the photons wavelengths between and +d ). The light is incident on a metal A of work function 1.55 eV . Saturation photo current is 6 mA . Now the same light is incident on metal B of work function 2.48 eV . Choose the correct options [Tale hc

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Correct answer: D. Saturation photo current for metal B will be 18 11 ~mA

Let d n be number of photons from to +d aligned & d E=d n (h c) & d E d =k & ₀^n(d n) h c=k ₄₀₀^ _ t n d aligned For A: _ t n =800 ~nm For B: _ t n =500 ~nm aligned & I₁ I₂ = 6 I₂ = 7^2-4^2 5^2-4^2 & I₂= 18 11 m A aligned

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