If the work function of a material is such that red light of wavelength (700 mathrm{~nm}) just

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If the work function of a material is such that red light of wavelength \(700 \mathrm{~nm}\) just barely initiates the photoelectric effect, what must the maximum kinetic energy of ejected electrons be when violet light of wavelength \(400 \mathrm{~nm}\) illuminates the material?

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