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In a photoelectric experiment, the work function of the material from which electrons are ejected equals...

In a photoelectric experiment, the work function of the material from which electrons are ejected equals 2.5eV. What is the maximum wavelength of light for which electrons are ejected from this material and what stopping voltage is required when light, having a wave lengthof 3.5x 10-7m, is used with this material(if one may take for Planck’s constant, h = 6.63 x 10−34Js, for the speed of light, c = 3.0 x 108m/s, and noting that:1 eV = 1.6 x 10−19J)?

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The maximum wavelength corresponds to minimum energy which means the electron will be just ejected and kinetic energy will be zero :

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