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When illuminating two light wavelengths λ1 = 3200Å and λ2 = 5200Å on a metal used...

When illuminating two light wavelengths λ1 = 3200Å and λ2 = 5200Å on a metal used
cathode of a photovoltaic cell, it is found that the ratio of the maximum initial velocity of the photoelectrons
equal to 2. Find the work of that metal. Indicate: Planck's constant, h = 6,625.10-34J.s; electric charge
electron, e = -1,6.10-19C; the speed of light c = 3,108m / s.
A. 1.89 eV. B. 1.90 eV. C. 1.92 eV. D. 1.98 eV.

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