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Two light sources of wavelengths λ and 2λ, respectively, are used successively in a photoelectric experiment....

Two light sources of wavelengths λ and 2λ, respectively, are used successively in a photoelectric experiment. The corresponding stoppage potentials are 3.2 V and 0.8 V, respectively. Calculate:
(a) the value of λ, in nm;
(b) the work function of the metal, in eV.
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